Tax - Income statement related/reconciliation of tax rate (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income from continuing operations before taxes (CHF)      
Switzerland SFr 257 SFr 1,770 SFr 2,985
Foreign (857) 1,697 1,735
Income/(loss) before taxes (600) 3,467 4,720
Current and deferred taxes      
Switzerland 316 163 175
Foreign 485 204 531
Current income tax expense 801 367 706
Switzerland 222 450 171
Foreign 3 (16) 418
Deferred income tax expense 225 434 589
Income tax expense 1,026 801 1,295
Income tax expense/(benefit) reported in shareholder's equity related to:      
Gains/(losses) on cash flow hedges (63) 25 13
Cumulative translation adjustment 4 0 (4)
Unrealized gains/(losses) on securities 0 (6) 7
Actuarial gains/(losses), Tax 228 (18) 99
Net prior service credit/(cost) (23) (33) 58
Share-based compensation and treasury shares (4) (4) (5)
Reconciliation of taxes computed at the Swiss statutory rate      
Income tax expense computed at the statutory tax rate (111) 693 1,038
Increase/(decrease) in income taxes resulting from:      
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount 370 (62) (101)
of which total foreign tax expense 488 188 949
Changes in tax law and rates (33) (6) (28)
Non-deductible amortization of other intangible assets and goodwill impairment (300) 0 1
Other non-deductible expenses 386 254 371
of which non-deductible interest expenses 200 117 274
of which resolution of interest cost deductibility with and between international tax authorities   157  
of which non-deductible bank levy costs and other non-deductible compensation expenses 39 68 56
of which non-deductible expenses or non-deductible provision accruals 93 46  
of which non-deductible other expenses 43 23 34
of which contingency accrual relating to non-deductible interest expense (11) (41) 28
Additional taxable income 15 8 7
Lower taxed income (146) (234) (325)
of which tax benefit in respect to non-taxable dividend income 41   45
of which tax benefit related non-taxable life insurance income 77 67 73
of which business transfer   (19) (160)
of which exempt income 15   14
of which concessionary and lower taxed income 15 67 26
of which revaluations of equity investments   79  
(Income)/loss taxable to non-controlling interests 11 18 8
Changes in deferred tax valuation allowance 621 322 116
Change in recognition of outside basis difference 2 (9) 4
(Windfall tax benefits)/shortfall tax charges on share-based compensation 37 76 39
Other 174 (259) 165
of which benefit relating to return to accrual adjustments following the close of a tax audit cycle and the impact of the closure of an advanced pricing agreement     (53)
of which tax (benefit)/charge from the impact of prior year adjustments (24) (82) (20)
of which tax benefit from the reduction in own-credit revaluation gains/(losses) 14 14 (58)
of which tax impact of transitional adjustments arising from adoption of new accounting standards 51 78 123
of which tax impact of the US Base Erosion and Anti-abuse Tax (BEAT), for 2021   26  
of which tax impact of the US Base Erosion and Anti-abuse Tax (BEAT), for 2020 29 (180) 165
of which change in tax rules   (141)  
of which withholding taxes 100 61  
Income tax expense 1,026 801 1,295
Switzerland      
Income from continuing operations before taxes (CHF)      
Income/(loss) before taxes SFr 257 SFr 1,770 SFr 2,985
Reconciliation of taxes computed at the Swiss statutory rate      
Swiss statutory rate (as a percent) 18.50% 20.00% 22.00%
Increase/(decrease) in income taxes resulting from:      
of which re-assessment of deferred tax assets in Switzerland reflecting changes in forecasted future profitability   SFr 252  
of which benefit earnings mix from group of Swiss entities   (34)  
UK      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance SFr 781   SFr (157)
Decrease in deferred tax valuation allowance 1,000    
Japan, US, UK [Member]      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance     273
UK and Switzerland      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance   353  
UK and Hong Kong      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance   (31)  
Switzerland, Hong Kong      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance (160)    
Asia Pacific      
Income from continuing operations before taxes (CHF)      
Income/(loss) before taxes 291 244 112
Bank      
Income from continuing operations before taxes (CHF)      
Switzerland 1,659 2,477 3,259
Foreign (1,750) 734 1,134
Income/(loss) before taxes (91) 3,211 4,393
Current and deferred taxes      
Switzerland 302 151 164
Foreign 472 188 518
Current income tax expense 774 339 682
Switzerland 156 367 194
Foreign 8 (9) 422
Deferred income tax expense 164 358 616
Income tax expense 938 697 1,298
Income tax expense/(benefit) reported in shareholder's equity related to:      
Gains/(losses) on cash flow hedges (62) 25 13
Cumulative translation adjustment 4 0 (4)
Unrealized gains/(losses) on securities (4) (6) 7
Actuarial gains/(losses), Tax 0 (19) 4
Net prior service credit/(cost) 0 1 0
Reconciliation of taxes computed at the Swiss statutory rate      
Income tax expense computed at the statutory tax rate (17) 642 966
Increase/(decrease) in income taxes resulting from:      
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount 92 (64) (109)
of which total foreign tax expense 480 179 940
Changes in tax law and rates (29) (5) 9
Non-deductible amortization of other intangible assets and goodwill impairment (181) 0 1
Other non-deductible expenses 369 253 368
of which non-deductible interest expenses 200 117 274
of which resolution of interest cost deductibility with and between international tax authorities   157  
of which non-deductible bank levy costs and other non-deductible compensation expenses 39 68 56
of which non-deductible expenses or non-deductible provision accruals 93 46  
of which non-deductible other expenses 28 23 34
of which contingency accrual relating to non-deductible interest expense (11) (41) 28
Additional taxable income 15 8 7
Lower taxed income (129) (221) (314)
of which tax benefit in respect to non-taxable dividend income 41   45
of which tax benefit related non-taxable life insurance income 77 67 73
of which business transfer   (19) (160)
of which exempt income 5   14
of which concessionary and lower taxed income 5 53 20
of which revaluations of equity investments   79  
(Income)/loss taxable to non-controlling interests 12 18 8
Changes in deferred tax valuation allowance 612 281 114
Change in recognition of outside basis difference 3 (13) 4
(Windfall tax benefits)/shortfall tax charges on share-based compensation 37 75 39
Other 154 (277) 205
of which benefit relating to return to accrual adjustments following the close of a tax audit cycle and the impact of the closure of an advanced pricing agreement     (53)
of which tax (benefit)/charge from the impact of prior year adjustments (30) (80) (20)
of which tax impact of transitional adjustments arising from adoption of new accounting standards   78 123
of which tax impact of the US Base Erosion and Anti-abuse Tax (BEAT), for 2021   26  
of which tax impact of the US Base Erosion and Anti-abuse Tax (BEAT), for 2020 29 (180) 165
of which change in tax rules   (141)  
of which withholding taxes 100 61  
Income tax expense 938 697 1,298
Bank | Switzerland      
Income from continuing operations before taxes (CHF)      
Income/(loss) before taxes SFr 1,659 SFr 2,477 SFr 3,259
Reconciliation of taxes computed at the Swiss statutory rate      
Swiss statutory rate (as a percent) 18.50% 20.00% 22.00%
Increase/(decrease) in income taxes resulting from:      
of which re-assessment of deferred tax assets in Switzerland reflecting changes in forecasted future profitability   SFr 222  
Increase in deferred tax valuation allowance SFr 900    
of which benefit earnings mix from group of Swiss entities 51 (34)  
Bank | UK      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance 771   SFr (158)
Bank | Japan, US, UK [Member]      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance     272
Bank | UK and Switzerland      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance   312  
Bank | UK and Hong Kong      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance   (31)  
Bank | Switzerland, Hong Kong      
Increase/(decrease) in income taxes resulting from:      
Changes in deferred tax valuation allowance (159)    
Bank | Asia Pacific      
Income from continuing operations before taxes (CHF)      
Income/(loss) before taxes SFr 230 SFr 162 SFr 360