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Transfers of financial assets (TFA) - Securitizations (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CMBS      
Transfers of financial assets disclosures      
Net gain/(loss) SFr 6 SFr (7) SFr 85
Proceeds from transfer of assets 3,401 3,525 9,209
Cash received on interests that continue to be held 49 42 52
Cash flows between transferee and transferor non cash proceeds from new transfers 512 180 161
RMBS      
Transfers of financial assets disclosures      
Net gain/(loss) (2) 70 32
Proceeds from transfer of assets 7,534 37,048 23,358
Purchases of previously transferred financial assets or their underlying collateral 0 (1,604) 0
Servicing fees 24 2 2
Cash received on interests that continue to be held 675 1,088 864
Cash flows between transferee and transferor non cash proceeds from new transfers 1,081 3,072 3,030
Other asset-backed financings      
Transfers of financial assets disclosures      
Net gain/(loss) 16 65 105
Proceeds from transfer of assets 6,740 12,129 9,564
Purchases of previously transferred financial assets or their underlying collateral (1,479) (1,323) (1,606)
Servicing fees 192 165 148
Cash received on interests that continue to be held 153 14 17
Cash flows between transferee and transferor non cash proceeds from new transfers 168 54 9
Bank | CMBS      
Transfers of financial assets disclosures      
Net gain/(loss) 6 (7) 85
Proceeds from transfer of assets 3,401 3,525 9,209
Cash received on interests that continue to be held 49 42 52
Cash flows between transferee and transferor non cash proceeds from new transfers 512 180 161
Bank | RMBS      
Transfers of financial assets disclosures      
Net gain/(loss) (2) 70 32
Proceeds from transfer of assets 7,534 37,048 23,358
Purchases of previously transferred financial assets or their underlying collateral 0 (1,604) 0
Servicing fees 24 2 2
Cash received on interests that continue to be held 675 1,088 864
Cash flows between transferee and transferor non cash proceeds from new transfers 1,081 3,072 3,030
Bank | Other asset-backed financings      
Transfers of financial assets disclosures      
Net gain/(loss) 16 65 105
Proceeds from transfer of assets 6,740 12,129 9,564
Purchases of previously transferred financial assets or their underlying collateral (1,479) (1,323) (1,606)
Servicing fees 192 165 148
Cash received on interests that continue to be held 153 14 17
Cash flows between transferee and transferor non cash proceeds from new transfers SFr 168 SFr 54 SFr 9