FI - Quantitative information about level 3 assets at fair value (Details 14)
SFr in Millions, Pure in Millions
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2020
CHF (SFr)
Assets    
Cash and Due from Banks SFr 308 SFr 525
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 68,623 57,994
Securities received as collateral 15,017 50,773
Trading assets 111,141 157,338
Available-for-sale Securities, Debt Securities 1,005 607
Other investments 4,094 3,794
Loans 10,243 11,408
Other intangible assets (mortgage servicing rights), at fair value 224 180
Other assets 9,184 8,373
Recurring basis    
Assets    
Cash and Due from Banks 308 525
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 68,623 57,994
Securities received as collateral 15,017 50,773
Trading assets 111,141 157,338
Available-for-sale Securities, Debt Securities 1,005 607
Other investments 4,094 3,794
Loans 10,243 11,408
Loans - of which commercial and industrial 2,984 3,534
Loans - of which financial institutions 4,305 4,588
Other intangible assets (mortgage servicing rights), at fair value 224 180
Other assets 9,184 8,373
Other assets - of which loans held-for-sale 7,380 6,446
Total assets at fair value 219,839 290,992
Recurring basis | Other equity investments    
Assets    
Other investments 3,237 2,759
Recurring basis | Life finance instruments    
Assets    
Other investments 789 920
Recurring basis | Debt securities    
Assets    
Trading assets 54,198 64,395
Recurring basis | Debt securities | Debt securities issued by foreign governments    
Assets    
Trading assets 23,408 27,957
Recurring basis | Debt securities | Corporate debt securities    
Assets    
Trading assets 9,590 11,477
Recurring basis | Debt securities | RMBS    
Assets    
Trading assets 17,457 21,439
Recurring basis | Equity securities    
Assets    
Trading assets 36,546 63,237
Recurring basis | Derivative instruments    
Assets    
Trading assets 17,559 25,531
Recurring basis | Other    
Assets    
Trading assets 2,838 4,175
Recurring basis | Level 3    
Assets    
Cash and Due from Banks 0 0
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 0 0
Securities received as collateral 14 101
Trading assets 4,503 7,535
Available-for-sale Securities, Debt Securities 0 0
Other investments 3,666 3,054
Loans 1,534 3,669
Loans - of which commercial and industrial 717 1,347
Loans - of which financial institutions 465 1,082
Other intangible assets (mortgage servicing rights), at fair value 167 180
Other assets 694 1,825
Other assets - of which loans held-for-sale 562 1,576
Total assets at fair value 10,578 16,364
Recurring basis | Level 3 | Option model    
Assets    
Loans - of which commercial and industrial   72
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member]    
Assets    
Loans - of which commercial and industrial 474 908
Loans - of which financial institutions 327 674
Other assets - of which loans held-for-sale SFr 281 SFr 296
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum    
Assets    
Loans - of which commercial and industrial, measurement input 184 237
Loans - of which financial institutions, measurement input 0 192
Other assets - of which loans held-for-sale, measurement input 0 246
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum    
Assets    
Loans - of which commercial and industrial, measurement input 3,325 1,480
Loans - of which financial institutions, measurement input 3,212 1,698
Other assets - of which loans held-for-sale, measurement input 563 506
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average    
Assets    
Loans - of which commercial and industrial, measurement input 809 554
Loans - of which financial institutions, measurement input 921 612
Other assets - of which loans held-for-sale, measurement input 314 343
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Minimum    
Assets    
Loans - of which commercial and industrial, measurement input   25
Loans - of which financial institutions, measurement input   25
Other assets - of which loans held-for-sale, measurement input   1
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Maximum    
Assets    
Loans - of which commercial and industrial, measurement input   25
Loans - of which financial institutions, measurement input   40
Other assets - of which loans held-for-sale, measurement input   40
Recurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Weighted average    
Assets    
Loans - of which commercial and industrial, measurement input   25
Loans - of which financial institutions, measurement input   25
Other assets - of which loans held-for-sale, measurement input   34
Recurring basis | Level 3 | Price    
Assets    
Loans - of which commercial and industrial SFr 209  
Loans - of which financial institutions SFr 158  
Recurring basis | Level 3 | Price | Measurement Input, Quoted Price [Member] | Minimum    
Assets    
Loans - of which commercial and industrial, measurement input 0  
Loans - of which financial institutions, measurement input 14  
Recurring basis | Level 3 | Price | Measurement Input, Quoted Price [Member] | Maximum    
Assets    
Loans - of which commercial and industrial, measurement input 100  
Loans - of which financial institutions, measurement input 76  
Recurring basis | Level 3 | Price | Measurement Input, Quoted Price [Member] | Weighted average    
Assets    
Loans - of which commercial and industrial, measurement input 50  
Loans - of which financial institutions, measurement input 31  
Recurring basis | Level 3 | Vendor price    
Assets    
Other assets - of which loans held-for-sale SFr 16  
Recurring basis | Level 3 | Vendor price | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Other assets - of which loans held-for-sale, measurement input 0  
Recurring basis | Level 3 | Vendor price | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Other assets - of which loans held-for-sale, measurement input 75  
Recurring basis | Level 3 | Vendor price | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Other assets - of which loans held-for-sale, measurement input 54  
Recurring basis | Level 3 | Market comparable    
Assets    
Loans - of which commercial and industrial SFr 6 SFr 338
Loans - of which financial institutions   190
Other assets - of which loans held-for-sale SFr 254 SFr 1,277
Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Loans - of which commercial and industrial, measurement input 19 0
Loans - of which financial institutions, measurement input   0
Other assets - of which loans held-for-sale, measurement input 0 0
Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Loans - of which commercial and industrial, measurement input 19 100
Loans - of which financial institutions, measurement input   100
Other assets - of which loans held-for-sale, measurement input 139 111
Recurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Loans - of which commercial and industrial, measurement input 19 70
Loans - of which financial institutions, measurement input   54
Other assets - of which loans held-for-sale, measurement input 67 71
Recurring basis | Level 3 | Market comparable | Measurement Input, Pre-IPO instrinsic option [Member] | Minimum    
Assets    
Loans - of which commercial and industrial, measurement input   100
Recurring basis | Level 3 | Market comparable | Measurement Input, Pre-IPO instrinsic option [Member] | Maximum    
Assets    
Loans - of which commercial and industrial, measurement input   100
Recurring basis | Level 3 | Market comparable | Measurement Input, Pre-IPO instrinsic option [Member] | Weighted average    
Assets    
Loans - of which commercial and industrial, measurement input   100
Recurring basis | Level 3 | Other equity investments    
Assets    
Other investments SFr 2,863 SFr 2,132
Recurring basis | Level 3 | Other equity investments | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Other investments 1  
Recurring basis | Level 3 | Other equity investments | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Other investments 1,292  
Recurring basis | Level 3 | Other equity investments | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Other investments 54  
Recurring basis | Level 3 | Other equity investments | Vendor price    
Assets    
Other investments   110
Recurring basis | Level 3 | Other equity investments | NAV/adjusted NAV    
Assets    
Other investments 929 974
Recurring basis | Level 3 | Other equity investments | NAV/adjusted NAV | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Other investments 287 310
Recurring basis | Level 3 | Other equity investments | NAV/adjusted NAV | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Other investments 287 310
Recurring basis | Level 3 | Other equity investments | NAV/adjusted NAV | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Other investments 287 310
Recurring basis | Level 3 | Other equity investments | Market comparable    
Assets    
Other investments 1,919  
Recurring basis | Level 3 | Life finance instruments    
Assets    
Other investments 789 920
Recurring basis | Level 3 | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum    
Assets    
Other investments 2 2
Recurring basis | Level 3 | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum    
Assets    
Other investments 16 15
Recurring basis | Level 3 | Life finance instruments | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average    
Assets    
Other investments 6 6
Recurring basis | Level 3 | Debt securities    
Assets    
Trading assets 1,225 2,253
Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments    
Assets    
Trading assets 35 140
Recurring basis | Level 3 | Debt securities | Corporate debt securities    
Assets    
Trading assets 478 1,270
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Option model    
Assets    
Trading assets 55 416
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member]    
Assets    
Trading assets   SFr 386
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Consolidation, Eliminations [Member]    
Assets    
Trading assets SFr 124  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Minimum    
Assets    
Trading assets, measurement input   (9)
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Maximum    
Assets    
Trading assets, measurement input   1,509
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Weighted average    
Assets    
Trading assets, measurement input   1,007
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Consolidation, Eliminations [Member] | Minimum    
Assets    
Trading assets, measurement input 50  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Consolidation, Eliminations [Member] | Maximum    
Assets    
Trading assets, measurement input 1,290  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Credit Spread [Member] | Consolidation, Eliminations [Member] | Weighted average    
Assets    
Trading assets, measurement input 701  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price in percent [Member] | Minimum    
Assets    
Trading assets, measurement input 0  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price in percent [Member] | Maximum    
Assets    
Trading assets, measurement input 100  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price in percent [Member] | Weighted average    
Assets    
Trading assets, measurement input 47  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Minimum    
Assets    
Trading assets, measurement input 39  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Maximum    
Assets    
Trading assets, measurement input 39  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Recovery rate [Member] | Weighted average    
Assets    
Trading assets, measurement input 1  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum    
Assets    
Trading assets, measurement input (50) (50)
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum    
Assets    
Trading assets, measurement input 100 100
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average    
Assets    
Trading assets, measurement input 68 55
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Fund gap risk [Member] | Minimum    
Assets    
Trading assets, measurement input 0  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Fund gap risk [Member] | Maximum    
Assets    
Trading assets, measurement input 3  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Fund gap risk [Member] | Weighted average    
Assets    
Trading assets, measurement input 1  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Minimum    
Assets    
Trading assets, measurement input   0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Maximum    
Assets    
Trading assets, measurement input   2
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Weighted average    
Assets    
Trading assets, measurement input   0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Minimum    
Assets    
Trading assets, measurement input   40
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Maximum    
Assets    
Trading assets, measurement input   40
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Recovery rate [Member] | Weighted average    
Assets    
Trading assets, measurement input   40
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum    
Assets    
Trading assets, measurement input 0 0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum    
Assets    
Trading assets, measurement input 163 158
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average    
Assets    
Trading assets, measurement input 17 23
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Price    
Assets    
Trading assets SFr 69  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Price | Measurement Input, Price in percent [Member] | Minimum    
Assets    
Trading assets, measurement input 35  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Price | Measurement Input, Price in percent [Member] | Maximum    
Assets    
Trading assets, measurement input 120  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Price | Measurement Input, Price in percent [Member] | Weighted average    
Assets    
Trading assets, measurement input 92  
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price    
Assets    
Trading assets SFr 145 SFr 71
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Trading assets, measurement input 0 0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Trading assets, measurement input 123 2,292
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Trading assets, measurement input 79 1,654
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Unadjusted NAV [Member] | Minimum    
Assets    
Trading assets, measurement input   1
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Unadjusted NAV [Member] | Maximum    
Assets    
Trading assets, measurement input   1
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Vendor price | Measurement Input, Unadjusted NAV [Member] | Weighted average    
Assets    
Trading assets, measurement input   1
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable    
Assets    
Trading assets SFr 107 SFr 321
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Trading assets, measurement input 0 0
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Trading assets, measurement input 110 227
Recurring basis | Level 3 | Debt securities | Corporate debt securities | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Trading assets, measurement input 63 95
Recurring basis | Level 3 | Debt securities | RMBS    
Assets    
Trading assets SFr 424 SFr 557
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum    
Assets    
Trading assets, measurement input 1  
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum    
Assets    
Trading assets, measurement input 29  
Recurring basis | Level 3 | Debt securities | RMBS | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average    
Assets    
Trading assets, measurement input 13  
Recurring basis | Level 3 | Equity securities    
Assets    
Trading assets SFr 195 124
Recurring basis | Level 3 | Derivative instruments    
Assets    
Trading assets 2,187 3,911
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives    
Assets    
Trading assets 624 733
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Option model    
Assets    
Trading assets 612  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Discounted Cash Flow [Member]    
Assets    
Trading assets SFr 6  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Minimum    
Assets    
Trading assets, measurement input 109  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Maximum    
Assets    
Trading assets, measurement input 166  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Funding spread [Member] | Weighted average    
Assets    
Trading assets, measurement input 127  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Volatility [Member] | Minimum    
Assets    
Trading assets, measurement input 0  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Volatility [Member] | Maximum    
Assets    
Trading assets, measurement input 100  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Volatility [Member] | Weighted average    
Assets    
Trading assets, measurement input 97  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum    
Assets    
Trading assets, measurement input (4)  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum    
Assets    
Trading assets, measurement input 100  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average    
Assets    
Trading assets, measurement input 9  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Mean reversion [Member] | Minimum    
Assets    
Trading assets, measurement input (55)  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Mean reversion [Member] | Maximum    
Assets    
Trading assets, measurement input (8)  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Mean reversion [Member] | Weighted average    
Assets    
Trading assets, measurement input 0  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Minimum    
Assets    
Trading assets, measurement input 0  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Maximum    
Assets    
Trading assets, measurement input 21  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Prepayment Rate [Member] | Weighted average    
Assets    
Trading assets, measurement input 17  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum    
Assets    
Trading assets, measurement input (3)  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum    
Assets    
Trading assets, measurement input 1  
Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average    
Assets    
Trading assets, measurement input 0  
Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives    
Assets    
Trading assets SFr 53 143
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products    
Assets    
Trading assets 212 SFr 1,186
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Buyback probability [Member] | Minimum    
Assets    
Trading assets, measurement input   50
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Buyback probability [Member] | Maximum    
Assets    
Trading assets, measurement input   100
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Buyback probability [Member] | Weighted average    
Assets    
Trading assets, measurement input   66
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Minimum    
Assets    
Trading assets, measurement input   (50)
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Maximum    
Assets    
Trading assets, measurement input   100
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Correlation [Member] | Weighted average    
Assets    
Trading assets, measurement input   58
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Minimum    
Assets    
Trading assets, measurement input   0
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Maximum    
Assets    
Trading assets, measurement input   4
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Gap risk [Member] | Weighted average    
Assets    
Trading assets, measurement input   0
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Minimum    
Assets    
Trading assets, measurement input   (2)
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Maximum    
Assets    
Trading assets, measurement input   158
Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Volatility [Member] | Weighted average    
Assets    
Trading assets, measurement input   24
Recurring basis | Level 3 | Derivative instruments | Other derivatives    
Assets    
Trading assets SFr 1,034 SFr 1,079
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum    
Assets    
Trading assets, measurement input 2 2
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum    
Assets    
Trading assets, measurement input 14 14
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average    
Assets    
Trading assets, measurement input 6 6
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Minimum    
Assets    
Trading assets, measurement input 73 72
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Maximum    
Assets    
Trading assets, measurement input 138 137
Recurring basis | Level 3 | Derivative instruments | Other derivatives | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Mortality Rate [Member] | Weighted average    
Assets    
Trading assets, measurement input 99 98
Recurring basis | Level 3 | Other    
Assets    
Trading assets SFr 896 SFr 1,247
Recurring basis | Level 3 | Other | Option model    
Assets    
Trading assets SFr 93  
Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Minimum    
Assets    
Trading assets, measurement input 0  
Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Maximum    
Assets    
Trading assets, measurement input 70  
Recurring basis | Level 3 | Other | Option model | Measurement Input, Mortality Rate [Member] | Weighted average    
Assets    
Trading assets, measurement input 6  
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member]    
Assets    
Trading assets SFr 611 766
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum    
Assets    
Other investments   9
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum    
Assets    
Other investments   9
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average    
Assets    
Other investments   SFr 9
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Minimum    
Assets    
Trading assets, measurement input 3 3
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Maximum    
Assets    
Trading assets, measurement input 14 14
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Market implied life expectancy [Member] | Weighted average    
Assets    
Trading assets, measurement input 7 7
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Minimum    
Assets    
Other investments   SFr 3
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Maximum    
Assets    
Other investments   3
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member] | Weighted average    
Assets    
Other investments   3
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Tax Swap Rate [Member] | Minimum    
Assets    
Trading assets, measurement input 30  
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Tax Swap Rate [Member] | Maximum    
Assets    
Trading assets, measurement input 30  
Recurring basis | Level 3 | Other | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Tax Swap Rate [Member] | Weighted average    
Assets    
Trading assets, measurement input 30  
Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Other investments   1
Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Other investments   1,249
Recurring basis | Level 3 | Other | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Other investments   713
Recurring basis | Level 3 | Other | Market comparable    
Assets    
Trading assets SFr 189  
Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Trading assets, measurement input 0  
Other investments   100
Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Trading assets, measurement input 130  
Other investments   100
Recurring basis | Level 3 | Other | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Trading assets, measurement input 34  
Other investments   100
Recurring basis | Level 3 | Other | Other equity investments | Valuation Technique, Discounted Cash Flow [Member]    
Assets    
Other investments   840
Recurring basis | Level 3 | Other | Other equity investments | Market comparable    
Assets    
Other investments   118
Nonrecurring basis    
Assets    
Other investments SFr 152 543
Loans 17 71
Other assets 139 201
Total assets at fair value 308 815
Nonrecurring basis | Equity securities    
Assets    
Other investments 118 303
Nonrecurring basis | Equity securities (without a readily determinable fair value)    
Assets    
Other investments 21 227
Nonrecurring basis | Other assets    
Assets    
Other assets - of which loans held-for-sale 73 136
Other assets - of which premises, equipment and right-of-use assets 61 58
Nonrecurring basis | Level 3    
Assets    
Other investments 152 326
Loans 5 4
Other assets 110 97
Total assets at fair value SFr 267 SFr 427
Nonrecurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   1
Nonrecurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   3
Nonrecurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   3
Nonrecurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   52
Nonrecurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   52
Nonrecurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   52
Nonrecurring basis | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Quoted Price [Member] | Minimum    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   52
Nonrecurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Minimum    
Assets    
Other assets - of which loans held-for-sale, measurement input 80 83
Other assets - of which premises, equipment and right-of-use assets, measurement input 60 2
Nonrecurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Maximum    
Assets    
Other assets - of which loans held-for-sale, measurement input 100 100
Other assets - of which premises, equipment and right-of-use assets, measurement input 60 2
Nonrecurring basis | Level 3 | Market comparable | Measurement Input, Price Volatility [Member] | Weighted average    
Assets    
Other assets - of which loans held-for-sale, measurement input 88 95
Other assets - of which premises, equipment and right-of-use assets, measurement input 60 2
Nonrecurring basis | Level 3 | Market comparable | Measurement Input, Quoted Price [Member] | Minimum    
Assets    
Other assets - of which premises, equipment and right-of-use assets, measurement input   2
Nonrecurring basis | Level 3 | Equity securities    
Assets    
Other investments SFr 118 SFr 303
Nonrecurring basis | Level 3 | Equity securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum    
Assets    
Other investments 8 10
Nonrecurring basis | Level 3 | Equity securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum    
Assets    
Other investments 13 14
Nonrecurring basis | Level 3 | Equity securities | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average    
Assets    
Other investments 13 12
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value)    
Assets    
Other investments 21 10
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Valuation Technique, Discounted Cash Flow [Member]    
Assets    
Other investments 16  
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum    
Assets    
Other investments 12  
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum    
Assets    
Other investments 16  
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted average    
Assets    
Other investments 14  
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Market comparable    
Assets    
Other investments 5  
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Market comparable | Measurement Input, Discount Rate [Member] | Minimum    
Assets    
Other investments 5  
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Market comparable | Measurement Input, Discount Rate [Member] | Maximum    
Assets    
Other investments 6,003  
Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value) | Market comparable | Measurement Input, Discount Rate [Member] | Weighted average    
Assets    
Other investments 2,441  
Nonrecurring basis | Level 3 | Other assets    
Assets    
Other assets - of which loans held-for-sale 45 39
Other assets - of which premises, equipment and right-of-use assets 60 54
Bank    
Assets    
Cash and Due from Banks 308 525
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 68,623 57,994
Securities received as collateral 15,017 50,773
Trading assets 111,299 157,511
Available-for-sale Securities, Debt Securities 1,003 605
Other investments 4,093 3,793
Loans 10,243 11,408
Other intangible assets (mortgage servicing rights), at fair value 224 180
Other assets 9,184 8,373
Bank | Recurring basis    
Assets    
Cash and Due from Banks 308 525
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 68,623 57,994
Securities received as collateral 15,017 50,773
Trading assets 111,299 157,511
Available-for-sale Securities, Debt Securities 1,003 605
Other investments 4,093 3,793
Loans 10,243 11,408
Loans - of which commercial and industrial 2,984 3,534
Loans - of which financial institutions 4,305 4,588
Other intangible assets (mortgage servicing rights), at fair value 224 180
Other assets 9,184 8,373
Other assets - of which loans held-for-sale 7,380 6,446
Total assets at fair value 219,994 291,162
Bank | Recurring basis | Other equity investments    
Assets    
Other investments 3,237 2,760
Bank | Recurring basis | Life finance instruments    
Assets    
Other investments 789 920
Bank | Recurring basis | Debt securities    
Assets    
Trading assets 54,297 64,532
Bank | Recurring basis | Debt securities | Debt securities issued by foreign governments    
Assets    
Trading assets 23,408 27,957
Bank | Recurring basis | Debt securities | Corporate debt securities    
Assets    
Trading assets 9,689 11,614
Bank | Recurring basis | Debt securities | RMBS    
Assets    
Trading assets 17,457 21,439
Bank | Recurring basis | Equity securities    
Assets    
Trading assets 36,606 63,273
Bank | Recurring basis | Derivative instruments    
Assets    
Trading assets 17,559 25,531
Bank | Recurring basis | Other    
Assets    
Trading assets 2,837 4,175
Bank | Recurring basis | Level 3    
Assets    
Cash and Due from Banks 0 0
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 0 0
Securities received as collateral 14 101
Trading assets 4,503 7,535
Available-for-sale Securities, Debt Securities 0 0
Other investments 3,666 3,054
Loans 1,534 3,669
Loans - of which commercial and industrial 717 1,347
Loans - of which financial institutions 465 1,082
Other intangible assets (mortgage servicing rights), at fair value 167 180
Other assets 694 1,825
Other assets - of which loans held-for-sale 562 1,576
Total assets at fair value 10,578 16,364
Bank | Recurring basis | Level 3 | Other equity investments    
Assets    
Other investments 2,863 2,132
Bank | Recurring basis | Level 3 | Life finance instruments    
Assets    
Other investments 789 920
Bank | Recurring basis | Level 3 | Debt securities    
Assets    
Trading assets 1,225 2,253
Bank | Recurring basis | Level 3 | Debt securities | Debt securities issued by foreign governments    
Assets    
Trading assets 35 140
Bank | Recurring basis | Level 3 | Debt securities | Corporate debt securities    
Assets    
Trading assets 478 1,270
Bank | Recurring basis | Level 3 | Debt securities | RMBS    
Assets    
Trading assets 424 557
Bank | Recurring basis | Level 3 | Equity securities    
Assets    
Trading assets 195 124
Bank | Recurring basis | Level 3 | Derivative instruments    
Assets    
Trading assets 2,187 3,911
Bank | Recurring basis | Level 3 | Derivative instruments | Interest rate derivatives    
Assets    
Trading assets 624 733
Bank | Recurring basis | Level 3 | Derivative instruments | Foreign exchange derivatives    
Assets    
Trading assets 53 143
Bank | Recurring basis | Level 3 | Derivative instruments | Equity/Index-related products    
Assets    
Trading assets 212 1,186
Bank | Recurring basis | Level 3 | Derivative instruments | Other derivatives    
Assets    
Trading assets 1,034 1,079
Bank | Recurring basis | Level 3 | Other    
Assets    
Trading assets 896 1,247
Bank | Nonrecurring basis    
Assets    
Other investments 152 543
Loans 17 71
Other assets 139 201
Total assets at fair value 308 815
Bank | Nonrecurring basis | Equity securities    
Assets    
Other investments 118 303
Bank | Nonrecurring basis | Equity securities (without a readily determinable fair value)    
Assets    
Other investments 21 227
Bank | Nonrecurring basis | Other assets    
Assets    
Other assets - of which loans held-for-sale 73 136
Other assets - of which premises, equipment and right-of-use assets 61 58
Bank | Nonrecurring basis | Level 3    
Assets    
Other investments 152 326
Loans 5 4
Other assets 110 97
Total assets at fair value 267 427
Bank | Nonrecurring basis | Level 3 | Equity securities    
Assets    
Other investments 118 303
Bank | Nonrecurring basis | Level 3 | Equity securities (without a readily determinable fair value)    
Assets    
Other investments 21 10
Bank | Nonrecurring basis | Level 3 | Other assets    
Assets    
Other assets - of which loans held-for-sale 45 39
Other assets - of which premises, equipment and right-of-use assets SFr 60 SFr 54