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Goodwill (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Gross amount of goodwill      
Balance at beginning of period SFr 7,758 SFr 7,748  
Foreign currency translation impact (66) 10  
Other 0 0  
Balance at end of period 7,692 7,758 SFr 7,748
Accumulated impairment      
Balance at beginning of period 4,890 4,867  
Goodwill impairment 2,346 23 976
Balance at end of period 7,236 4,890 4,867
Net book value      
Net book value 456 2,868  
Operating Segments | Wealth Management      
Gross amount of goodwill      
Balance at beginning of period 1,281 1,300  
Foreign currency translation impact (10) 4  
Other 0 (23)  
Balance at end of period 1,271 1,281 1,300
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 1,271 0  
Balance at end of period 1,271 0 0
Net book value      
Net book value 0 1,281  
Operating Segments | Swiss Bank      
Gross amount of goodwill      
Balance at beginning of period 481 480  
Foreign currency translation impact (25) 1  
Other 0 0  
Balance at end of period 456 481 480
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 0 0  
Balance at end of period 0 0 0
Net book value      
Net book value 456 481  
Operating Segments | Asset Management      
Gross amount of goodwill      
Balance at beginning of period 1,106 1,101  
Foreign currency translation impact (31) 5  
Other (30) 0  
Balance at end of period 1,045 1,106 1,101
Accumulated impairment      
Balance at beginning of period 0 0  
Goodwill impairment 1,045 0  
Balance at end of period 1,045 0 0
Net book value      
Net book value 0 1,106  
Operating Segments | Non-core Legacy      
Gross amount of goodwill      
Balance at beginning of period 4,890 4,867  
Foreign currency translation impact 0 0  
Other 30 23  
Balance at end of period 4,920 4,890 4,867
Accumulated impairment      
Balance at beginning of period 4,890 4,867  
Goodwill impairment 30 23  
Balance at end of period 4,920 4,890 SFr 4,867
Net book value      
Net book value 0 SFr 0  
Operating Segments | Strategic Resolution Unit (old)      
Gross amount of goodwill      
Balance at end of period 12    
Adjustments | Wealth Management      
Accumulated impairment      
Goodwill impairment 23    
Adjustments | Asset Management      
Accumulated impairment      
Goodwill impairment SFr 6