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Transfers of financial assets (TFA) - Securitizations (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
CMBS      
Transfers of financial assets disclosures      
Net gain/(loss) SFr 0 SFr 6 SFr (7)
Proceeds from transfer of assets 0 3,401 3,525
Cash received on interests that continue to be held 18 49 42
Cash flows between transferee and transferor non cash proceeds from new transfers 0 512 180
RMBS      
Transfers of financial assets disclosures      
Net gain/(loss) 0 (2) 70
Proceeds from transfer of assets 0 7,534 37,048
Purchases of previously transferred financial assets or their underlying collateral 0 0 (1,604)
Servicing fees 12 24 2
Cash received on interests that continue to be held 51 675 1,088
Cash flows between transferee and transferor non cash proceeds from new transfers 0 1,081 3,072
Other asset-backed financings      
Transfers of financial assets disclosures      
Net gain/(loss) 7 16 65
Proceeds from transfer of assets 7,008 6,740 12,129
Purchases of previously transferred financial assets or their underlying collateral (232) (1,479) (1,323)
Servicing fees 217 192 165
Cash received on interests that continue to be held 301 153 14
Cash flows between transferee and transferor non cash proceeds from new transfers SFr 4,186 SFr 168 SFr 54