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CECL (Details 2) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Loans Held at Amortized Cost, Allowance for Credit Losses, Beginning Balance SFr 1,362 SFr 1,296 SFr 1,535
Current-period provision for expected credit losses 1,013 241 25
of which methodology change 5 0 (1)
of which provisions for interest 118 51 48
Gross write-offs (600) (181) (297)
Recoveries 11 15 14
Net write-offs (589) (166) (283)
Foreign currency translation impact and other adjustments, net (110) (9) 19
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 1,680 1,362 1,296
of which individually evaluated 1,174 845 785
of which collectively evaluated 506 517 511
Loans held at amortized cost      
Purchases 4,783 4,620 4,383
Reclassifications from loans held-for-sale 30 95 133
Reclassifications to loans held-for-sale 10,824 9,516 4,780
Sales 2,454 2,485 4,442
Cumulative Effect, Period of Adoption, Adjustment [Member]      
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Current-period provision for expected credit losses 4    
Corporate and institutional      
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Loans Held at Amortized Cost, Allowance for Credit Losses, Beginning Balance 1,003 939 1,217
Current-period provision for expected credit losses 833 184 (53)
of which methodology change 5 0 (1)
of which provisions for interest 58 29 23
Gross write-offs (542) (116) (242)
Recoveries 1 3 5
Net write-offs (541) (113) (237)
Foreign currency translation impact and other adjustments, net (84) (7) 12
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 1,215 1,003 939
of which individually evaluated 863 572 512
of which collectively evaluated 352 431 427
Loans held at amortized cost      
Purchases 4,714 4,603 4,361
Reclassifications from loans held-for-sale 30 95 133
Reclassifications to loans held-for-sale 10,824 9,516 4,780
Sales 2,454 2,485 4,442
Consumer      
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Loans Held at Amortized Cost, Allowance for Credit Losses, Beginning Balance 359 357 318
Current-period provision for expected credit losses 180 57 78
of which methodology change 0 0 0
of which provisions for interest 60 22 25
Gross write-offs (58) (65) (55)
Recoveries 10 12 9
Net write-offs (48) (53) (46)
Foreign currency translation impact and other adjustments, net (26) (2) 7
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 465 359 357
of which individually evaluated 311 273 273
of which collectively evaluated 154 86 84
Loans held at amortized cost      
Purchases 69 17 22
Reclassifications from loans held-for-sale 0 0 0
Reclassifications to loans held-for-sale 0 0 0
Sales SFr 0 SFr 0 SFr 0