FI - Roll-forward of liabilities measured at fair value on recurring basis (Details 5) - Recurring basis - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Customer deposits    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities SFr 448 SFr 474
Transfers in, liabilities 0 0
Transfers out, liabilities 0 0
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 (27)
Gain (loss) on transfers in/out included in trading revenues, liabilities 0 0
Gain (loss) on all other activity included in trading revenues, liabilities (18) 7
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (14) 10
Foreign currency translation impact, liabilities (22) (16)
Balance at end of period, liabilities 394 448
Customer deposits | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (29) 46
Obligation to return securities received as collateral    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 101 1
Transfers in, liabilities 0 0
Transfers out, liabilities 0 0
Purchases, liabilities 73 213
Sales, liabilities (164) (106)
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Gain (loss) on transfers in/out included in trading revenues, liabilities 0 0
Gain (loss) on all other activity included in trading revenues, liabilities 0 0
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 4 (7)
Balance at end of period, liabilities 14 101
Obligation to return securities received as collateral | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 0 0
Trading liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 4,246 3,854
Transfers in, liabilities 1,007 848
Transfers out, liabilities (2,703) (1,614)
Purchases, liabilities 45 471
Sales, liabilities (56) (310)
Issuances, liabilities 1,135 2,146
Settlements, liabilities (1,498) (2,375)
Gain (loss) on transfers in/out included in trading revenues, liabilities 340 260
Gain (loss) on all other activity included in trading revenues, liabilities 138 1,428
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 155 (462)
Balance at end of period, liabilities 2,809 4,246
Trading liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 653 1,653
Trading liabilities | Derivative instruments    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 4,191 3,801
Transfers in, liabilities 838 829
Transfers out, liabilities (2,553) (1,611)
Purchases, liabilities 19 198
Sales, liabilities (8) (8)
Issuances, liabilities 1,135 2,146
Settlements, liabilities (1,498) (2,375)
Gain (loss) on transfers in/out included in trading revenues, liabilities 340 259
Gain (loss) on all other activity included in trading revenues, liabilities 166 1,410
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 154 (458)
Balance at end of period, liabilities 2,784 4,191
Trading liabilities | Derivative instruments | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 629 1,646
Trading liabilities | Derivative instruments | Equity/Index-related products    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 2,010 1,921
Transfers in, liabilities 562 248
Transfers out, liabilities (1,498) (954)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 581 776
Settlements, liabilities (644) (536)
Gain (loss) on transfers in/out included in trading revenues, liabilities 353 167
Gain (loss) on all other activity included in trading revenues, liabilities 352 644
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 71 (256)
Balance at end of period, liabilities 1,787 2,010
Trading liabilities | Derivative instruments | Equity/Index-related products | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 712 1,162
Trading liabilities | Derivative instruments | Credit derivatives    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,335 1,211
Transfers in, liabilities   539
Transfers out, liabilities   (562)
Purchases, liabilities   0
Sales, liabilities   0
Issuances, liabilities   1,111
Settlements, liabilities   (1,425)
Gain (loss) on transfers in/out included in trading revenues, liabilities   85
Gain (loss) on all other activity included in trading revenues, liabilities   502
Gain (loss) on transfers in/out included in other revenues, liabilities   0
Gain (loss) on all other activity included in other revenues, liabilities   0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities   0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities   0
Foreign currency translation impact, liabilities   (126)
Balance at end of period, liabilities   1,335
Trading liabilities | Derivative instruments | Credit derivatives | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses   277
Short-term borrowings    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 701 997
Transfers in, liabilities 359 37
Transfers out, liabilities (550) (294)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 1,766 1,307
Settlements, liabilities (1,363) (1,189)
Gain (loss) on transfers in/out included in trading revenues, liabilities (35) 4
Gain (loss) on all other activity included in trading revenues, liabilities 128 (62)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 26 (99)
Balance at end of period, liabilities 1,032 701
Short-term borrowings | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 72 94
Long-term debt    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 7,268 12,610
Transfers in, liabilities 4,767 3,214
Transfers out, liabilities (6,677) (7,478)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 11,323 5,891
Settlements, liabilities (6,863) (5,622)
Gain (loss) on transfers in/out included in trading revenues, liabilities (38) 568
Gain (loss) on all other activity included in trading revenues, liabilities (316) (708)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities (5) 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 99
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (50) (81)
Foreign currency translation impact, liabilities 267 (1,225)
Balance at end of period, liabilities 9,676 7,268
Long-term debt | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (32) 236
Long-term debt | Long-term debt - of which structured notes over one year and up to two years    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,133 891
Transfers in, liabilities 1,802 689
Transfers out, liabilities (1,979) (676)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 2,052 1,022
Settlements, liabilities (1,663) (690)
Gain (loss) on transfers in/out included in trading revenues, liabilities (26) 40
Gain (loss) on all other activity included in trading revenues, liabilities 104 (38)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities (1) 1
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (1) (1)
Foreign currency translation impact, liabilities 43 (105)
Balance at end of period, liabilities 1,464 1,133
Long-term debt | Long-term debt - of which structured notes over one year and up to two years | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (2) (19)
Long-term debt | Long-term debt - of which structured notes over two years    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 5,526 11,458
Transfers in, liabilities 2,965 1,614
Transfers out, liabilities (4,314) (6,479)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 7,540 4,766
Settlements, liabilities (5,038) (4,577)
Gain (loss) on transfers in/out included in trading revenues, liabilities 11 532
Gain (loss) on all other activity included in trading revenues, liabilities (528) (683)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 1 98
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (47) (92)
Foreign currency translation impact, liabilities 202 (1,111)
Balance at end of period, liabilities 6,318 5,526
Long-term debt | Long-term debt - of which structured notes over two years | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (312) 224
Long-term debt | Long-term debt - of which other debt instruments over two years    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 165  
Transfers in, liabilities 0  
Transfers out, liabilities (2)  
Purchases, liabilities 0  
Sales, liabilities 0  
Issuances, liabilities 1,616  
Settlements, liabilities (36)  
Gain (loss) on transfers in/out included in trading revenues, liabilities 0  
Gain (loss) on all other activity included in trading revenues, liabilities 105  
Gain (loss) on transfers in/out included in other revenues, liabilities 0  
Gain (loss) on all other activity included in other revenues, liabilities 0  
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0  
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0  
Foreign currency translation impact, liabilities 6  
Balance at end of period, liabilities 1,854 165
Long-term debt | Long-term debt - of which other debt instruments over two years | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 306  
Other liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,271 1,385
Transfers in, liabilities 21 160
Transfers out, liabilities (556) (183)
Purchases, liabilities 51 266
Sales, liabilities (89) (277)
Issuances, liabilities 116 129
Settlements, liabilities (501) (396)
Gain (loss) on transfers in/out included in trading revenues, liabilities 10 (33)
Gain (loss) on all other activity included in trading revenues, liabilities (28) 37
Gain (loss) on transfers in/out included in other revenues, liabilities 113 0
Gain (loss) on all other activity included in other revenues, liabilities 66 300
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 44 (117)
Balance at end of period, liabilities 518 1,271
Other liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 26 64
Liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 14,035 19,321
Transfers in, liabilities 6,154 4,259
Transfers out, liabilities (10,486) (9,569)
Purchases, liabilities 169 950
Sales, liabilities (309) (693)
Issuances, liabilities 14,340 9,473
Settlements, liabilities (10,225) (9,609)
Gain (loss) on transfers in/out included in trading revenues, liabilities 277 799
Gain (loss) on all other activity included in trading revenues, liabilities (96) 702
Gain (loss) on transfers in/out included in other revenues, liabilities 113 0
Gain (loss) on all other activity included in other revenues, liabilities 61 300
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 99
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (64) (71)
Foreign currency translation impact, liabilities 474 (1,926)
Balance at end of period, liabilities 14,443 14,035
Liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 690 2,093
Bank | Customer deposits    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 448 474
Transfers in, liabilities 0 0
Transfers out, liabilities 0 0
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 (27)
Gain (loss) on transfers in/out included in trading revenues, liabilities 0 0
Gain (loss) on all other activity included in trading revenues, liabilities (18) 7
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (14) 10
Foreign currency translation impact, liabilities (22) (16)
Balance at end of period, liabilities 394 448
Bank | Customer deposits | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (29) 46
Bank | Obligation to return securities received as collateral    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 101 1
Transfers in, liabilities 0 0
Transfers out, liabilities 0 0
Purchases, liabilities 73 213
Sales, liabilities (164) (106)
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Gain (loss) on transfers in/out included in trading revenues, liabilities 0 0
Gain (loss) on all other activity included in trading revenues, liabilities 0 0
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 4 (7)
Balance at end of period, liabilities 14 101
Bank | Obligation to return securities received as collateral | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 0 0
Bank | Trading liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 4,246 3,854
Transfers in, liabilities 1,007 848
Transfers out, liabilities (2,703) (1,614)
Purchases, liabilities 45 471
Sales, liabilities (56) (310)
Issuances, liabilities 1,135 2,146
Settlements, liabilities (1,498) (2,375)
Gain (loss) on transfers in/out included in trading revenues, liabilities 340 260
Gain (loss) on all other activity included in trading revenues, liabilities 138 1,428
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 155 (462)
Balance at end of period, liabilities 2,809 4,246
Bank | Trading liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 653 1,653
Bank | Trading liabilities | Derivative instruments    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 4,191 3,801
Transfers in, liabilities 838 829
Transfers out, liabilities (2,553) (1,611)
Purchases, liabilities 19 198
Sales, liabilities (8) (8)
Issuances, liabilities 1,135 2,146
Settlements, liabilities (1,498) (2,375)
Gain (loss) on transfers in/out included in trading revenues, liabilities 340 259
Gain (loss) on all other activity included in trading revenues, liabilities 166 1,410
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 154 (458)
Balance at end of period, liabilities 2,784 4,191
Bank | Trading liabilities | Derivative instruments | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 629 1,646
Bank | Trading liabilities | Derivative instruments | Equity/Index-related products    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 2,010 1,921
Transfers in, liabilities 562 248
Transfers out, liabilities (1,498) (954)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 581 776
Settlements, liabilities (644) (536)
Gain (loss) on transfers in/out included in trading revenues, liabilities 353 167
Gain (loss) on all other activity included in trading revenues, liabilities 352 644
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 71 (256)
Balance at end of period, liabilities 1,787 2,010
Bank | Trading liabilities | Derivative instruments | Equity/Index-related products | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 712 1,162
Bank | Trading liabilities | Derivative instruments | Credit derivatives    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,335 1,211
Transfers in, liabilities   539
Transfers out, liabilities   (562)
Purchases, liabilities   0
Sales, liabilities   0
Issuances, liabilities   1,111
Settlements, liabilities   (1,425)
Gain (loss) on transfers in/out included in trading revenues, liabilities   85
Gain (loss) on all other activity included in trading revenues, liabilities   502
Gain (loss) on transfers in/out included in other revenues, liabilities   0
Gain (loss) on all other activity included in other revenues, liabilities   0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities   0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities   0
Foreign currency translation impact, liabilities   (126)
Balance at end of period, liabilities   1,335
Bank | Trading liabilities | Derivative instruments | Credit derivatives | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses   277
Bank | Short-term borrowings    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 701 997
Transfers in, liabilities 359 37
Transfers out, liabilities (550) (294)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 1,766 1,307
Settlements, liabilities (1,363) (1,189)
Gain (loss) on transfers in/out included in trading revenues, liabilities (35) 4
Gain (loss) on all other activity included in trading revenues, liabilities 128 (62)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 26 (99)
Balance at end of period, liabilities 1,032 701
Bank | Short-term borrowings | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 72 94
Bank | Long-term debt    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 7,286 12,749
Transfers in, liabilities 4,767 3,089
Transfers out, liabilities (6,698) (7,478)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 11,323 5,891
Settlements, liabilities (6,863) (5,622)
Gain (loss) on transfers in/out included in trading revenues, liabilities (36) 568
Gain (loss) on all other activity included in trading revenues, liabilities (324) (690)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 99
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (49) (82)
Foreign currency translation impact, liabilities 270 (1,238)
Balance at end of period, liabilities 9,676 7,286
Bank | Long-term debt | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (31) 209
Bank | Long-term debt | Long-term debt - of which structured notes over one year and up to two years    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,133 891
Transfers in, liabilities 1,802 689
Transfers out, liabilities (1,979) (676)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 2,052 1,022
Settlements, liabilities (1,663) (690)
Gain (loss) on transfers in/out included in trading revenues, liabilities (26) 40
Gain (loss) on all other activity included in trading revenues, liabilities 104 (38)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities (1) 1
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (1) (1)
Foreign currency translation impact, liabilities 43 (105)
Balance at end of period, liabilities 1,464 1,133
Bank | Long-term debt | Long-term debt - of which structured notes over one year and up to two years | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (2) (19)
Bank | Long-term debt | Long-term debt - of which structured notes over two years    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 5,526 11,458
Transfers in, liabilities 2,965 1,614
Transfers out, liabilities (4,314) (6,479)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 7,540 4,766
Settlements, liabilities (5,038) (4,577)
Gain (loss) on transfers in/out included in trading revenues, liabilities 11 532
Gain (loss) on all other activity included in trading revenues, liabilities (528) (683)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities 0 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 1 98
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (47) (92)
Foreign currency translation impact, liabilities 202 (1,111)
Balance at end of period, liabilities 6,318 5,526
Bank | Long-term debt | Long-term debt - of which structured notes over two years | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (312) 224
Bank | Long-term debt | Long-term debt - of which other debt instruments over two years    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 165  
Transfers in, liabilities 0  
Transfers out, liabilities (2)  
Purchases, liabilities 0  
Sales, liabilities 0  
Issuances, liabilities 1,616  
Settlements, liabilities (36)  
Gain (loss) on transfers in/out included in trading revenues, liabilities 0  
Gain (loss) on all other activity included in trading revenues, liabilities 105  
Gain (loss) on transfers in/out included in other revenues, liabilities 0  
Gain (loss) on all other activity included in other revenues, liabilities 0  
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0  
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0  
Foreign currency translation impact, liabilities 6  
Balance at end of period, liabilities 1,854 165
Bank | Long-term debt | Long-term debt - of which other debt instruments over two years | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 306  
Bank | Other liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,250 1,367
Transfers in, liabilities 21 160
Transfers out, liabilities (538) (183)
Purchases, liabilities 51 266
Sales, liabilities (89) (277)
Issuances, liabilities 116 129
Settlements, liabilities (493) (390)
Gain (loss) on transfers in/out included in trading revenues, liabilities 10 (33)
Gain (loss) on all other activity included in trading revenues, liabilities (28) 37
Gain (loss) on transfers in/out included in other revenues, liabilities 109 0
Gain (loss) on all other activity included in other revenues, liabilities 66 289
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 0
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 0 0
Foreign currency translation impact, liabilities 42 (115)
Balance at end of period, liabilities 517 1,250
Bank | Other liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 26 64
Bank | Liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 14,032 19,442
Transfers in, liabilities 6,154 4,134
Transfers out, liabilities (10,489) (9,569)
Purchases, liabilities 169 950
Sales, liabilities (309) (693)
Issuances, liabilities 14,340 9,473
Settlements, liabilities (10,217) (9,603)
Gain (loss) on transfers in/out included in trading revenues, liabilities 279 799
Gain (loss) on all other activity included in trading revenues, liabilities (104) 720
Gain (loss) on transfers in/out included in other revenues, liabilities 109 0
Gain (loss) on all other activity included in other revenues, liabilities 66 289
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 0 99
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities (63) (72)
Foreign currency translation impact, liabilities 475 (1,937)
Balance at end of period, liabilities 14,442 14,032
Bank | Liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses SFr 691 SFr 2,066