Segment information - Balance sheet related (Details 2) - CHF (SFr)
SFr in Millions
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information    
Total assets SFr 755,833 SFr 818,965
Americas    
Segment Reporting Information    
Total assets 249,656 300,762
Asia Pacific    
Segment Reporting Information    
Total assets 86,257 96,508
EMEA    
Segment Reporting Information    
Total assets 163,659 159,661
Switzerland    
Segment Reporting Information    
Total assets 256,261 262,034
Operating Segments | Swiss Universal Bank    
Segment Reporting Information    
Total assets 263,797 261,465
Operating Segments | International Wealth Management    
Segment Reporting Information    
Total assets 88,715 91,503
Operating Segments | Asia Pacific    
Segment Reporting Information    
Total assets 67,395 67,356
Operating Segments | Investment Bank    
Segment Reporting Information    
Total assets 211,802 271,976
Operating Segments | Asset Management    
Segment Reporting Information    
Total assets 3,393 3,703
Corporate Center    
Segment Reporting Information    
Total assets 120,731 122,962
Bank    
Segment Reporting Information    
Total assets 759,214 822,831
Bank | Americas    
Segment Reporting Information    
Total assets 249,680 300,783
Bank | Asia Pacific    
Segment Reporting Information    
Total assets 86,121 96,488
Bank | EMEA    
Segment Reporting Information    
Total assets 163,539 159,465
Bank | Switzerland    
Segment Reporting Information    
Total assets 259,874 266,095
Bank | Operating Segments | Swiss Universal Bank    
Segment Reporting Information    
Total assets 263,797 261,465
Bank | Operating Segments | International Wealth Management    
Segment Reporting Information    
Total assets 88,715 91,503
Bank | Operating Segments | Asia Pacific    
Segment Reporting Information    
Total assets 67,395 67,356
Bank | Operating Segments | Investment Bank    
Segment Reporting Information    
Total assets 211,802 271,976
Bank | Operating Segments | Asset Management    
Segment Reporting Information    
Total assets 3,393 3,703
Bank | Adjustments    
Segment Reporting Information    
Total assets SFr 124,112 SFr 126,828