Summary of significant accounting policies - Revision of prior period (Details 3)
SFr in Millions
12 Months Ended
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2019
CHF (SFr)
Assets SFr 755,833 SFr 818,965  
Liabilities 711,603 776,024  
Net Cash Provided by (Used in) Operating Activities 36,938 (6,031) SFr (17,338)
Net Cash Provided by (Used in) Investing Activities (10,082) 14,450 (2,359)
Net Cash Provided by (Used in) Financing Activities (47) 31,481 22,136
Revision of Prior Period, Adjustment, Netting treatment [Member]      
Assets 13,143    
Liabilities (13,143)    
Net Cash Provided by (Used in) Investing Activities (70)    
Net Cash Provided by (Used in) Financing Activities SFr 70    
Leverage Ratio, increase/decrease (in basis points) 10    
Revision of Prior Period, Adjustment, Share-based Compensation Reclassification [Member]      
Net Cash Provided by (Used in) Operating Activities SFr 483 1,086  
Net Cash Provided by (Used in) Investing Activities (2,294) (1,033)  
Net Cash Provided by (Used in) Financing Activities 1,811 (53)  
Bank      
Assets 759,214 822,831  
Liabilities 711,127 775,772  
Net Cash Provided by (Used in) Operating Activities 36,893 (5,792) (17,439)
Net Cash Provided by (Used in) Investing Activities (10,139) 13,369 (4,206)
Net Cash Provided by (Used in) Financing Activities 179 32,205 SFr 23,970
Bank | Revision of Prior Period, Adjustment, Netting treatment [Member]      
Assets 13,143    
Liabilities (13,143)    
Net Cash Provided by (Used in) Investing Activities (70)    
Net Cash Provided by (Used in) Financing Activities SFr 70    
Leverage Ratio, increase/decrease (in basis points) 10    
Bank | Revision of Prior Period, Adjustment, Share-based Compensation Reclassification [Member]      
Net Cash Provided by (Used in) Operating Activities SFr 371 979  
Net Cash Provided by (Used in) Investing Activities (2,273) (1,045)  
Net Cash Provided by (Used in) Financing Activities SFr 1,902 SFr 66