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FI - Roll-forward of liabilities measured at fair value on recurring basis (Details 5) - Recurring basis - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Customer deposits    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities SFr 252 SFr 394
Transfers in, liabilities 0 0
Transfers out, liabilities 0 0
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 309 0
Settlements, liabilities (38) (15)
Gain (loss) on transfers in/out included in trading revenues, liabilities 0 0
Gain (loss) on all other activity included in trading revenues, liabilities (210) (26)
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 (19) (41)
Foreign currency translation impact, liabilities (20) (13)
Balance at end of period, liabilities 274 299
Customer deposits | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (12) (70)
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   14
Transfers in, liabilities   0
Transfers out, liabilities   0
Purchases, liabilities   0
Sales, liabilities   (14)
Issuances, liabilities   0
Settlements, liabilities   0
Gain (loss) on transfers in/out included in trading revenues, liabilities   0
Gain (loss) on all other activity included in trading revenues, liabilities   0
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   0
Balance at end of period, liabilities   0
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
Trading liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,881 2,809
Transfers in, liabilities 401 856
Transfers out, liabilities (378) (882)
Purchases, liabilities 75 18
Sales, liabilities (47) (83)
Issuances, liabilities 417 502
Settlements, liabilities (392) (629)
Gain (loss) on transfers in/out included in trading revenues, liabilities 69 37
Gain (loss) on all other activity included in trading revenues, liabilities 490 (290)
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 (55) 118
Balance at end of period, liabilities 2,461 2,456
Trading liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 462 (188)
Trading liabilities | Derivative instruments    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 1,640 2,784
Transfers in, liabilities 400 746
Transfers out, liabilities (377) (870)
Purchases, liabilities 0 0
Sales, liabilities 0 (61)
Issuances, liabilities 417 502
Settlements, liabilities (392) (629)
Gain (loss) on transfers in/out included in trading revenues, liabilities 69 38
Gain (loss) on all other activity included in trading revenues, liabilities 421 (228)
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 (46) 120
Balance at end of period, liabilities 2,132 2,402
Trading liabilities | Derivative instruments | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 409 (180)
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 1,083 1,787
Transfers in, liabilities 204 611
Transfers out, liabilities (320) (596)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 336 279
Settlements, liabilities (122) (232)
Gain (loss) on transfers in/out included in trading revenues, liabilities 63 (9)
Gain (loss) on all other activity included in trading revenues, liabilities 237 (468)
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 (29) 75
Balance at end of period, liabilities 1,452 1,447
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 341 (348)
Trading liabilities | Derivative instruments | Credit derivatives    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 242  
Transfers in, liabilities 167  
Transfers out, liabilities (41)  
Purchases, liabilities 0  
Sales, liabilities 0  
Issuances, liabilities 17  
Settlements, liabilities (194)  
Gain (loss) on transfers in/out included in trading revenues, liabilities 4  
Gain (loss) on all other activity included in trading revenues, liabilities 48  
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 (4)  
Balance at end of period, liabilities 239  
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 29  
Trading liabilities | Derivative instruments | Other derivatives    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 196 540
Transfers in, liabilities (1) 7
Transfers out, liabilities 1 (4)
Purchases, liabilities 0 0
Sales, liabilities 0 (61)
Issuances, liabilities 49 89
Settlements, liabilities (46) (113)
Gain (loss) on transfers in/out included in trading revenues, liabilities (1) 3
Gain (loss) on all other activity included in trading revenues, liabilities 89 73
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 (8) 26
Balance at end of period, liabilities 279 560
Trading liabilities | Derivative instruments | Other derivatives | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 4 (15)
Short-term borrowings    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 453 1,032
Transfers in, liabilities 129 124
Transfers out, liabilities (112) (522)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 128 639
Settlements, liabilities (380) (500)
Gain (loss) on transfers in/out included in trading revenues, liabilities 5 (43)
Gain (loss) on all other activity included in trading revenues, liabilities (11) (58)
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 1 0
Foreign currency translation impact, liabilities (9) 44
Balance at end of period, liabilities 204 716
Short-term borrowings | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses (54) 18
Long-term debt    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 6,734 9,676
Transfers in, liabilities 2,069 1,259
Transfers out, liabilities (1,971) (4,863)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 1,552 4,531
Settlements, liabilities (2,101) (2,960)
Gain (loss) on transfers in/out included in trading revenues, liabilities 103 (499)
Gain (loss) on all other activity included in trading revenues, liabilities (39) (746)
Gain (loss) on transfers in/out included in other revenues, liabilities 0 0
Gain (loss) on all other activity included in other revenues, liabilities (28) 0
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 29 (35)
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 223 (202)
Foreign currency translation impact, liabilities (216) 495
Balance at end of period, liabilities 6,355 6,656
Long-term debt | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 47 (756)
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 4,307 6,318
Transfers in, liabilities 1,559 1,106
Transfers out, liabilities (1,527) (3,441)
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 1,426 3,888
Settlements, liabilities (1,812) (2,595)
Gain (loss) on transfers in/out included in trading revenues, liabilities 97 (416)
Gain (loss) on all other activity included in trading revenues, liabilities 115 (586)
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 27 (34)
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 216 (201)
Foreign currency translation impact, liabilities (145) 344
Balance at end of period, liabilities 4,263 4,383
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 225 (740)
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 1,728 1,854
Transfers in, liabilities 101 0
Transfers out, liabilities 0 0
Purchases, liabilities 0 0
Sales, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (45) (26)
Gain (loss) on transfers in/out included in trading revenues, liabilities 0 0
Gain (loss) on all other activity included in trading revenues, liabilities (169) (84)
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 (51) 82
Balance at end of period, liabilities 1,564 1,826
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 (191) 0
Other liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 203 517
Transfers in, liabilities 394 41
Transfers out, liabilities (2) (2)
Purchases, liabilities 24 8
Sales, liabilities (34) (21)
Issuances, liabilities 51 58
Settlements, liabilities (57) (71)
Gain (loss) on transfers in/out included in trading revenues, liabilities (2) (2)
Gain (loss) on all other activity included in trading revenues, liabilities 63 (22)
Gain (loss) on transfers in/out included in other revenues, liabilities (4) 1
Gain (loss) on all other activity included in other revenues, liabilities (356) (35)
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 (3) 23
Balance at end of period, liabilities 277 495
Other liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses 21 16
Liabilities    
Liabilities measured at fair value on a recurring basis for level 3    
Balance at beginning of period, liabilities 9,523 14,442
Transfers in, liabilities 2,993 2,280
Transfers out, liabilities (2,463) (6,269)
Purchases, liabilities 99 26
Sales, liabilities (81) (118)
Issuances, liabilities 2,457 5,730
Settlements, liabilities (2,968) (4,175)
Gain (loss) on transfers in/out included in trading revenues, liabilities 175 (507)
Gain (loss) on all other activity included in trading revenues, liabilities 293 (1,142)
Gain (loss) on transfers in/out included in other revenues, liabilities (4) 1
Gain (loss) on all other activity included in other revenues, liabilities (384) (35)
Gain (loss) on transfers in/out included in accumulated other comprehensive income, liabilities 29 (35)
Gain (loss) on all other activity included in accumulated other comprehensive income, liabilities 205 (243)
Foreign currency translation impact, liabilities (303) 667
Balance at end of period, liabilities 9,571 10,622
Liabilities | Net Revenue [Member]    
Liabilities measured at fair value on a recurring basis for level 3    
Changes in unrealized gains/losses SFr 464 SFr (980)