FI - Own credit gains/(losses) on fair value option elected instruments (Details 17) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financial instruments    
Gains/(losses) recorded into AOCI SFr 299 SFr 48
Gains/(losses) recorded into AOCI, Cumulatively (2,252)  
Gains/(losses) recorded into AOCI transferred to net income 103 156
Due to banks and customer deposits    
Financial instruments    
Gains/(losses) recorded into AOCI 14 (9)
Gains/(losses) recorded into AOCI, Cumulatively (62)  
Gains/(losses) recorded into AOCI transferred to net income 0 0
Short-term borrowings    
Financial instruments    
Gains/(losses) recorded into AOCI 19 (13)
Gains/(losses) recorded into AOCI, Cumulatively (51)  
Gains/(losses) recorded into AOCI transferred to net income 0 1
Long-term debt    
Financial instruments    
Gains/(losses) recorded into AOCI 266 70
Gains/(losses) recorded into AOCI, Cumulatively (2,139)  
Gains/(losses) recorded into AOCI transferred to net income 103 155
Long-term debt - of which structured notes over two years    
Financial instruments    
Gains/(losses) recorded into AOCI 359 (177)
Gains/(losses) recorded into AOCI, Cumulatively (1,132)  
Gains/(losses) recorded into AOCI transferred to net income 103 155
Long-term debt - of which treasury debt over two years    
Financial instruments    
Gains/(losses) recorded into AOCI (129) 234
Gains/(losses) recorded into AOCI, Cumulatively (921)  
Gains/(losses) recorded into AOCI transferred to net income 0 0
Bank    
Financial instruments    
Gains/(losses) recorded into AOCI 296 2
Gains/(losses) recorded into AOCI, Cumulatively (2,200)  
Gains/(losses) recorded into AOCI transferred to net income 103 156
Bank | Due to banks and customer deposits    
Financial instruments    
Gains/(losses) recorded into AOCI 14 (9)
Gains/(losses) recorded into AOCI, Cumulatively (62)  
Gains/(losses) recorded into AOCI transferred to net income 0 0
Bank | Short-term borrowings    
Financial instruments    
Gains/(losses) recorded into AOCI 19 (13)
Gains/(losses) recorded into AOCI, Cumulatively (51)  
Gains/(losses) recorded into AOCI transferred to net income 0 1
Bank | Long-term debt    
Financial instruments    
Gains/(losses) recorded into AOCI 263 24
Gains/(losses) recorded into AOCI, Cumulatively (2,087)  
Gains/(losses) recorded into AOCI transferred to net income 103 155
Bank | Long-term debt - of which structured notes over two years    
Financial instruments    
Gains/(losses) recorded into AOCI 361 (177)
Gains/(losses) recorded into AOCI, Cumulatively (1,142)  
Gains/(losses) recorded into AOCI transferred to net income 103 155
Bank | Long-term debt - of which treasury debt over two years    
Financial instruments    
Gains/(losses) recorded into AOCI (134) 188
Gains/(losses) recorded into AOCI, Cumulatively (859)  
Gains/(losses) recorded into AOCI transferred to net income SFr 0 SFr 0