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CECL (Details 2) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Loans Held at Amortized Cost, Allowance for Credit Losses, Beginning Balance SFr 1,297 SFr 1,536 SFr 1,049
Current-period provision for expected credit losses 239 25 900
of which methodology change 0 (1) (19)
of which provisions for interest 51 48 37
Gross write-offs (181) (297) (325)
Recoveries 15 14 13
Net write-offs (166) (283) (312)
Foreign currency translation impact and other adjustments, net (7) 19 (101)
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 1,363 1,297 1,536
of which individually evaluated 845 785 866
of which collectively evaluated 518 512 670
Loans held at amortized cost      
Purchases 4,620 4,383 2,801
Reclassifications from loans held-for-sale 95 133 6
Reclassifications to loans held-for-sale 9,516 4,780 2,025
Sales 2,485 4,442 1,644
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     103
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 940 1,218 808
Current-period provision for expected credit losses 184 (53) 709
of which methodology change 0 (1) (19)
of which provisions for interest 29 23 15
Gross write-offs (116) (242) (238)
Recoveries 3 5 5
Net write-offs (113) (237) (233)
Foreign currency translation impact and other adjustments, net (7) 12 (66)
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 1,004 940 1,218
of which individually evaluated 572 512 636
of which collectively evaluated 432 428 582
Loans held at amortized cost      
Purchases 4,603 4,361 2,756
Reclassifications from loans held-for-sale 95 133 6
Reclassifications to loans held-for-sale 9,516 4,780 2,007
Sales 2,485 4,442 1,626
Corporate and institutional | 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     48
Consumer      
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Loans Held at Amortized Cost, Allowance for Credit Losses, Beginning Balance 357 318 241
Current-period provision for expected credit losses 55 78 191
of which methodology change 0 0 0
of which provisions for interest 22 25 22
Gross write-offs (65) (55) (87)
Recoveries 12 9 8
Net write-offs (53) (46) (79)
Foreign currency translation impact and other adjustments, net 0 7 (35)
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 359 357 318
of which individually evaluated 273 273 230
of which collectively evaluated 86 84 88
Loans held at amortized cost      
Purchases 17 22 45
Reclassifications from loans held-for-sale 0 0 0
Reclassifications to loans held-for-sale 0 0 18
Sales 0 0 18
Consumer | 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     55
Bank      
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Loans Held at Amortized Cost, Allowance for Credit Losses, Beginning Balance 1,296 1,535 1,048
Current-period provision for expected credit losses 241 25 900
of which methodology change 0 (1) (19)
of which provisions for interest 51 48 37
Gross write-offs (181) (297) (325)
Recoveries 15 14 13
Net write-offs (166) (283) (312)
Foreign currency translation impact and other adjustments, net (9) 19 (101)
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 1,362 1,296 1,535
of which individually evaluated 845 785 865
of which collectively evaluated 517 511 670
Loans held at amortized cost      
Purchases 4,620 4,383 2,801
Reclassifications from loans held-for-sale 95 133 6
Reclassifications to loans held-for-sale 9,516 4,780 2,025
Sales 2,485 4,442 1,644
Bank | 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     103
Bank | 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 939 1,217 807
Current-period provision for expected credit losses 184 (53) 709
of which methodology change 0 (1) (19)
of which provisions for interest 29 23 15
Gross write-offs (116) (242) (238)
Recoveries 3 5 5
Net write-offs (113) (237) (233)
Foreign currency translation impact and other adjustments, net (7) 12 (66)
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 1,003 939 1,217
of which individually evaluated 572 512 635
of which collectively evaluated 431 427 582
Loans held at amortized cost      
Purchases 4,603 4,361 2,756
Reclassifications from loans held-for-sale 95 133 6
Reclassifications to loans held-for-sale 9,516 4,780 2,007
Sales 2,485 4,442 1,626
Bank | Corporate and institutional | 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     48
Bank | Consumer      
Loans Held At Amortized Cost, Allowance for Credit Losses [Roll Forward]      
Loans Held at Amortized Cost, Allowance for Credit Losses, Beginning Balance 357 318 241
Current-period provision for expected credit losses 57 78 191
of which methodology change 0 0 0
of which provisions for interest 22 25 22
Gross write-offs (65) (55) (87)
Recoveries 12 9 8
Net write-offs (53) (46) (79)
Foreign currency translation impact and other adjustments, net (2) 7 (35)
Loans Held at Amortized Cost, Allowance for Credit Losses, Ending Balance 359 357 318
of which individually evaluated 273 273 230
of which collectively evaluated 86 84 88
Loans held at amortized cost      
Purchases 17 22 45
Reclassifications from loans held-for-sale 0 0 0
Reclassifications to loans held-for-sale 0 0 18
Sales SFr 0 SFr 0 18
Bank | Consumer | 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     SFr 55