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Goodwill (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gross amount of goodwill        
Balance at beginning of period SFr 8,440 SFr 8,431 SFr 8,317  
Foreign currency translation impact   9 117  
Other   0 (3)  
Balance at end of period   8,440 8,431 SFr 8,317
Accumulated impairment        
Balance at beginning of period 5,537 5,514 3,891  
Goodwill impairment   23 1,623 0
Balance at end of period   5,537 5,514 3,891
Net book value        
Net book value   2,903 2,917  
Operating Segments | Wealth Management        
Gross amount of goodwill        
Balance at beginning of period 1,304 1,323 1,299  
Foreign currency translation impact   4 27  
Other   (23) (3)  
Balance at end of period   1,304 1,323 1,299
Accumulated impairment        
Balance at beginning of period 0 0 0  
Goodwill impairment   0 0  
Balance at end of period   0 0 0
Net book value        
Net book value   SFr 1,304 1,323  
Percentage by which goodwill fair value exceeds carrying value   10.00%    
Operating Segments | Investment Bank        
Gross amount of goodwill        
Balance at beginning of period 5,525 SFr 5,502 5,459  
Foreign currency translation impact   0 43  
Other   23 0  
Balance at end of period   5,525 5,502 5,459
Accumulated impairment        
Balance at beginning of period 5,525 5,502 3,879  
Goodwill impairment 30 23 1,623  
Balance at end of period   5,525 5,502 3,879
Net book value        
Net book value   0 0  
Operating Segments | Swiss Bank        
Gross amount of goodwill        
Balance at beginning of period 488 487 479  
Foreign currency translation impact   1 8  
Other   0 0  
Balance at end of period   488 487 479
Accumulated impairment        
Balance at beginning of period 0 0 0  
Goodwill impairment   0 0  
Balance at end of period   0 0 0
Net book value        
Net book value   488 487  
Operating Segments | Asset Management        
Gross amount of goodwill        
Balance at beginning of period 1,111 1,107 1,068  
Foreign currency translation impact   4 39  
Other   0 0  
Balance at end of period   1,111 1,107 1,068
Accumulated impairment        
Balance at beginning of period 0 0 0  
Goodwill impairment   0 0  
Balance at end of period   0 0 0
Net book value        
Net book value   SFr 1,111 1,107  
Percentage by which goodwill fair value exceeds carrying value   10.00%    
Operating Segments | Strategic Resolution Unit (old)        
Gross amount of goodwill        
Balance at beginning of period 12      
Balance at end of period   SFr 12    
Bank        
Gross amount of goodwill        
Balance at beginning of period 7,758 7,748 7,646  
Foreign currency translation impact   10 105  
Other   0 (3)  
Balance at end of period   7,758 7,748 7,646
Accumulated impairment        
Balance at beginning of period 4,890 4,867 3,891  
Goodwill impairment   23 976 0
Balance at end of period   4,890 4,867 3,891
Net book value        
Net book value   2,868 2,881  
Bank | Operating Segments | Wealth Management        
Gross amount of goodwill        
Balance at beginning of period 1,281 1,300 1,275  
Foreign currency translation impact   4 28  
Other   (23) (3)  
Balance at end of period   1,281 1,300 1,275
Accumulated impairment        
Balance at beginning of period 0 0 0  
Goodwill impairment   0 0  
Balance at end of period   0 0 0
Net book value        
Net book value   1,281 1,300  
Bank | Operating Segments | Investment Bank        
Gross amount of goodwill        
Balance at beginning of period 4,878 4,855 4,825  
Foreign currency translation impact   0 30  
Other   23 0  
Balance at end of period   4,878 4,855 4,825
Accumulated impairment        
Balance at beginning of period 4,878 4,855 3,879  
Goodwill impairment   23 976  
Balance at end of period   4,878 4,855 3,879
Net book value        
Net book value   0 0  
Bank | Operating Segments | Swiss Bank        
Gross amount of goodwill        
Balance at beginning of period 481 480 472  
Foreign currency translation impact   1 8  
Other   0 0  
Balance at end of period   481 480 472
Accumulated impairment        
Balance at beginning of period 0 0 0  
Goodwill impairment   0 0  
Balance at end of period   0 0 0
Net book value        
Net book value   481 480  
Bank | Operating Segments | Asset Management        
Gross amount of goodwill        
Balance at beginning of period 1,106 1,101 1,062  
Foreign currency translation impact   5 39  
Other   0 0  
Balance at end of period   1,106 1,101 1,062
Accumulated impairment        
Balance at beginning of period 0 0 0  
Goodwill impairment   0 0  
Balance at end of period   0 0 SFr 0
Net book value        
Net book value   1,106 SFr 1,101  
Bank | Operating Segments | Strategic Resolution Unit (old)        
Gross amount of goodwill        
Balance at beginning of period 12      
Balance at end of period   SFr 12    
The Klein Group LLC (MK&C) [Member] | Operating Segments | Investment Bank        
Accumulated impairment        
Goodwill impairment SFr 60