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TFA - Key economic assumptions at balance sheet date (Details 4) - CHF (SFr)
SFr in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
CMBS    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Fair value of beneficial interests held in SPEs SFr 517.0 SFr 69.0
Weighted-average life, in years 2 years 9 months 18 days 7 months 6 days
Impact on fair value from 10% adverse change in cash flow discount rate SFr (8.2) SFr (0.4)
Impact on fair value from 20% adverse change in cash flow discount rate (16.1) (0.8)
Impact on fair value from 10% adverse change in expected credit losses (4.6) (0.4)
Impact on fair value from 20% adverse change in expected credit losses SFr (9.1) SFr (0.7)
CMBS | Minimum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Cash flow discount rate per annum, in % (as a percent) 5.40% 27.80%
Expected credit losses rate (rate per annum), in % (as a percent) 1.10% 21.70%
CMBS | Maximum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Cash flow discount rate per annum, in % (as a percent) 42.10% 40.80%
Expected credit losses rate (rate per annum), in % (as a percent) 29.20% 35.30%
CMBS | Non-investment grade    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Fair value of beneficial interests held in SPEs SFr 111.0 SFr 27.0
RMBS    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Fair value of beneficial interests held in SPEs SFr 1,050.0 SFr 273.0
Weighted-average life, in years 9 years 8 years 1 month 6 days
Impact on fair value from 10% adverse change in prepayment speed SFr (16.5) SFr (2.2)
Impact on fair value from 20% adverse change in prepayment speed (32.7) (4.6)
Impact on fair value from 10% adverse change in cash flow discount rate (41.6) (10.4)
Impact on fair value from 20% adverse change in cash flow discount rate (79.6) (20.1)
Impact on fair value from 10% adverse change in expected credit losses (19.7) (5.3)
Impact on fair value from 20% adverse change in expected credit losses SFr (38.2) SFr (10.3)
RMBS | Minimum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Prepayment speed assumption (rate per annum), in % (as a percent) 2.40% 4.10%
Cash flow discount rate per annum, in % (as a percent) 4.40% 6.50%
Expected credit losses rate (rate per annum), in % (as a percent) 1.50% 2.60%
RMBS | Maximum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Prepayment speed assumption (rate per annum), in % (as a percent) 21.40% 20.40%
Cash flow discount rate per annum, in % (as a percent) 29.60% 28.10%
Expected credit losses rate (rate per annum), in % (as a percent) 25.50% 24.20%
RMBS | Non-investment grade    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Fair value of beneficial interests held in SPEs SFr 137.0 SFr 91.0
Other asset-backed financings    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Fair value of beneficial interests held in SPEs SFr 519.0 SFr 359.0
Weighted-average life, in years 5 years 1 month 6 days 4 years 6 months
Impact on fair value from 10% adverse change in cash flow discount rate SFr (10.5) SFr (7.5)
Impact on fair value from 20% adverse change in cash flow discount rate (20.5) (14.6)
Impact on fair value from 10% adverse change in expected credit losses (5.7) (4.3)
Impact on fair value from 20% adverse change in expected credit losses SFr (11.1) SFr (8.3)
Other asset-backed financings | Minimum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Cash flow discount rate per annum, in % (as a percent) 4.10% 3.20%
Expected credit losses rate (rate per annum), in % (as a percent) 0.50% 0.70%
Other asset-backed financings | Maximum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Cash flow discount rate per annum, in % (as a percent) 41.90% 39.60%
Expected credit losses rate (rate per annum), in % (as a percent) 37.90% 35.80%
Other asset-backed financings | Non-investment grade    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Fair value of beneficial interests held in SPEs SFr 34.0 SFr 15.0