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TFA - Key economic assumptions at time of transfer (Details 3) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Key economic assumptions used in measuring fair value at time of transfer      
Prepayment speed rate assumed used for projecting payments over the life of a residential mortgage loan (as a percent) 100.00%    
Prepayment rate per annum of the outstanding principal balance of mortgage loans in the first month assuming 100% prepayment (as a percent) 0.20%    
Prepayment rate per annum of the outstanding principal balance of mortgage loans after the first month assuming 100% prepayment (as a percent) 0.20%    
Constant prepayment rate assumed using a 100% prepayment assumption (as a percent) 6.00%    
CMBS      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 486 SFr 196 SFr 342
Weighted-average life, in years 4 years 1 month 6 days 5 years 2 months 12 days 6 years 4 months 24 days
CMBS | Minimum      
Key economic assumptions used in measuring fair value at time of transfer      
Cash flow discount rate (rate per annum), in % (as a percent) 3.50% 1.80% 1.40%
Expected credit losses (rate per annum), in % (as a percent) 2.70% 0.90% 1.90%
CMBS | Maximum      
Key economic assumptions used in measuring fair value at time of transfer      
Cash flow discount rate (rate per annum), in % (as a percent) 15.70% 5.00% 20.90%
Expected credit losses (rate per annum), in % (as a percent) 5.60% 4.30% 8.60%
CMBS | Level 2      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 415 SFr 170 SFr 305
CMBS | Level 3      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer 71 26 37
RMBS      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 847 SFr 2,594 SFr 2,692
Weighted-average life, in years 9 years 6 months 5 years 3 months 18 days 3 years 9 months 18 days
RMBS | Minimum      
Key economic assumptions used in measuring fair value at time of transfer      
Prepayment speed assumption (rate per annum) in % (as a percent) 5.00% 3.00% 1.00%
Cash flow discount rate (rate per annum), in % (as a percent) 2.80% 1.00% 0.20%
Expected credit losses (rate per annum), in % (as a percent) 1.30% 0.10% 1.60%
RMBS | Maximum      
Key economic assumptions used in measuring fair value at time of transfer      
Prepayment speed assumption (rate per annum) in % (as a percent) 22.20% 37.70% 47.00%
Cash flow discount rate (rate per annum), in % (as a percent) 53.80% 33.40% 40.80%
Expected credit losses (rate per annum), in % (as a percent) 49.80% 32.50% 22.90%
RMBS | Level 2      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 762 SFr 2,126 SFr 2,398
RMBS | Level 3      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 85 468 294
Bank      
Key economic assumptions used in measuring fair value at time of transfer      
Prepayment speed rate assumed used for projecting payments over the life of a residential mortgage loan (as a percent) 100.00%    
Prepayment rate per annum of the outstanding principal balance of mortgage loans in the first month assuming 100% prepayment (as a percent) 0.20%    
Prepayment rate per annum of the outstanding principal balance of mortgage loans after the first month assuming 100% prepayment (as a percent) 0.20%    
Constant prepayment rate assumed using a 100% prepayment assumption (as a percent) 6.00%    
Bank | CMBS      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 486 SFr 196 SFr 342
Weighted-average life, in years 4 years 1 month 6 days 5 years 2 months 12 days 6 years 4 months 24 days
Bank | CMBS | Minimum      
Key economic assumptions used in measuring fair value at time of transfer      
Cash flow discount rate (rate per annum), in % (as a percent) 3.50% 1.80% 1.40%
Expected credit losses (rate per annum), in % (as a percent) 2.70% 0.90% 1.90%
Bank | CMBS | Maximum      
Key economic assumptions used in measuring fair value at time of transfer      
Cash flow discount rate (rate per annum), in % (as a percent) 15.70% 5.00% 20.90%
Expected credit losses (rate per annum), in % (as a percent) 5.60% 4.30% 8.60%
Bank | CMBS | Level 2      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 415 SFr 170 SFr 305
Bank | CMBS | Level 3      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer 71 26 37
Bank | RMBS      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 847 SFr 2,594 SFr 2,692
Weighted-average life, in years 9 years 6 months 5 years 3 months 18 days 3 years 9 months 18 days
Bank | RMBS | Minimum      
Key economic assumptions used in measuring fair value at time of transfer      
Prepayment speed assumption (rate per annum) in % (as a percent) 5.00% 3.00% 1.00%
Cash flow discount rate (rate per annum), in % (as a percent) 2.80% 1.00% 0.20%
Expected credit losses (rate per annum), in % (as a percent) 1.30% 0.10% 1.60%
Bank | RMBS | Maximum      
Key economic assumptions used in measuring fair value at time of transfer      
Prepayment speed assumption (rate per annum) in % (as a percent) 22.20% 37.70% 47.00%
Cash flow discount rate (rate per annum), in % (as a percent) 53.80% 33.40% 40.80%
Expected credit losses (rate per annum), in % (as a percent) 49.80% 32.50% 22.90%
Bank | RMBS | Level 2      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 762 SFr 2,126 SFr 2,398
Bank | RMBS | Level 3      
Key economic assumptions used in measuring fair value at time of transfer      
Fair value of beneficial interests at time of transfer SFr 85 SFr 468 SFr 294