Goodwill (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gross amount of goodwill      
Balance at beginning of period SFr 8,317 SFr 8,554  
Goodwill acquired during the period   131  
Foreign currency translation impact 117 (316)  
Other (3) (52)  
Balance at end of period 8,431 8,317 SFr 8,554
Accumulated impairment      
Balance at beginning of period 3,891 3,891  
Goodwill impairment 1,623 0 0
Balance at end of period 5,514 3,891 3,891
Net book value      
Net book value 2,917 4,426  
Operating Segments | Swiss Universal Bank      
Gross amount of goodwill      
Balance at beginning of period 575 607  
Goodwill acquired during the period   0  
Foreign currency translation impact 10 (29)  
Other 0 (3)  
Balance at end of period 585 575 607
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 0    
Balance at end of period 0 0 0
Net book value      
Net book value 585 575  
Operating Segments | International Wealth Management      
Gross amount of goodwill      
Balance at beginning of period 284 295  
Goodwill acquired during the period   0  
Foreign currency translation impact 4 (10)  
Other (3) (1)  
Balance at end of period 285 284 295
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 0    
Balance at end of period 0 0 0
Net book value      
Net book value 285 284  
Operating Segments | Asia Pacific      
Gross amount of goodwill      
Balance at beginning of period 1,021 995  
Goodwill acquired during the period   98  
Foreign currency translation impact 22 (62)  
Other 0 (10)  
Balance at end of period 1,043 1,021 995
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 103    
Balance at end of period 103 0 0
Net book value      
Net book value 940 1,021  
Operating Segments | Asset Management      
Gross amount of goodwill      
Balance at beginning of period 1,068 1,199  
Goodwill acquired during the period   9  
Foreign currency translation impact 39 (102)  
Other 0 (38)  
Balance at end of period 1,107 1,068 1,199
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 0    
Balance at end of period 0 0 0
Net book value      
Net book value 1,107 1,068  
Operating Segments | Investment Bank      
Gross amount of goodwill      
Balance at beginning of period 5,357 5,446  
Goodwill acquired during the period   24  
Foreign currency translation impact 42 (113)  
Other 0 0  
Balance at end of period 5,399 5,357 5,446
Accumulated impairment      
Balance at beginning of period 3,879 3,879  
Goodwill impairment 1,520    
Balance at end of period 5,399 3,879 3,879
Net book value      
Net book value 0 1,478  
Operating Segments | Strategic Resolution Unit (old)      
Gross amount of goodwill      
Balance at end of period 12    
Bank      
Gross amount of goodwill      
Balance at beginning of period 7,646 7,851  
Goodwill acquired during the period   131  
Foreign currency translation impact 105 (284)  
Other (3) (52)  
Balance at end of period 7,748 7,646 7,851
Accumulated impairment      
Balance at beginning of period 3,891 3,891  
Goodwill impairment 976 0 0
Balance at end of period 4,867 3,891 3,891
Net book value      
Net book value 2,881 3,755  
Bank | Operating Segments | Swiss Universal Bank      
Gross amount of goodwill      
Balance at beginning of period 557 589  
Goodwill acquired during the period   0  
Foreign currency translation impact 10 (30)  
Other 0 (2)  
Balance at end of period 567 557 589
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 0    
Balance at end of period 0 0 0
Net book value      
Net book value 567 557  
Bank | Operating Segments | International Wealth Management      
Gross amount of goodwill      
Balance at beginning of period 276 288  
Goodwill acquired during the period   0  
Foreign currency translation impact 4 (11)  
Other (3) (1)  
Balance at end of period 277 276 288
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 0    
Balance at end of period 0 0 0
Net book value      
Net book value 277 276  
Bank | Operating Segments | Asia Pacific      
Gross amount of goodwill      
Balance at beginning of period 1,005 986  
Goodwill acquired during the period   98  
Foreign currency translation impact 25 (68)  
Other 0 (11)  
Balance at end of period 1,030 1,005 986
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 94    
Balance at end of period 94 0 0
Net book value      
Net book value 936 1,005  
Bank | Operating Segments | Asset Management      
Gross amount of goodwill      
Balance at beginning of period 1,062 1,193  
Goodwill acquired during the period   9  
Foreign currency translation impact 39 (102)  
Other 0 (38)  
Balance at end of period 1,101 1,062 1,193
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 0    
Balance at end of period 0 0 0
Net book value      
Net book value 1,101 1,062  
Bank | Operating Segments | Investment Bank      
Gross amount of goodwill      
Balance at beginning of period 4,734 4,783  
Goodwill acquired during the period   24  
Foreign currency translation impact 27 (73)  
Other 0 0  
Balance at end of period 4,761 4,734 4,783
Accumulated impairment      
Balance at beginning of period 3,879 3,879  
Goodwill impairment 882    
Balance at end of period 4,761 3,879 SFr 3,879
Net book value      
Net book value 0 SFr 855  
Bank | Operating Segments | Strategic Resolution Unit (old)      
Gross amount of goodwill      
Balance at end of period SFr 12