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CECL (Details 4) - CHF (SFr) SFr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward] |  |  |
Cash and due from banks, held at amortized cost, Allowance for Credit Loss, Beginning Balance | SFr (0) |  |
Interest-bearing deposits with banks, held at amortized cost, Allowance for Credit Loss, Beginning Balance | (0) |  |
Securities purchased under resale agreements and securities borrowing transactions, held at amortized cost, Allowance for Credit Loss, Beginning Balance | (0) |  |
Brokerage receivables, held at amortized cost, Allowance for Credit Loss, Beginning Balance | 4,081 |  |
Other assets, held at amortized cost, Allowance for Credit Loss, Beginning Balance | 37 |  |
Other financial assets, held at amortized cost, Allowance for Credit Loss, Beginning Balance | 4,118 | SFr 4,214 | SFr 48
Other financial assets, Current-period provision for expected credit losses | 127 | (135) | 4,295
Other financial assets, Gross write-offs | (4,035) | (7) | (8)
Other financial assets, Recovery | 2 | 0 | 0
Other financial assets, Net write-offs | (4,033) | (7) | (8)
Other financial assets, Foreign currency translation impact and other adjustments, net | (51) | 46 | (121)
Cash and due from banks, held at amortized cost, Allowance for Credit Loss, Ending Balance | 108 | (0) |
Interest-bearing deposits with banks, held at amortized cost, Allowance for Credit Loss, Ending Balance | (0) | (0) |
Securities purchased under resale agreements and securities borrowing transactions, held at amortized cost, Allowance for Credit Loss, Ending Balance | (0) | (0) |
Brokerage receivables, held at amortized cost, Allowance for Credit Loss, Ending Balance | (0) | 4,081 |
Other assets, held at amortized cost, Allowance for Credit Loss, Ending Balance | 53 | 37 |
Other financial assets, held at amortized cost, Allowance for Credit Loss, Ending Balance | 161 | 4,118 | 4,214
Other financial assets, individually evaluated | 129 | 4,096 | 4,200
Other financial assets, collectively evaluated | 32 | 22 | 14
Other financial assets change in method credit loss expense reversal | 3 | 0 | 0
Debt securities held-to-maturity, before allowance for credit losses | 1,417 | 921 |
Debt securities issued by foreign governments |  |  |
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward] |  |  |
Debt securities held-to-maturity, before allowance for credit losses | 1,259 | 921 |
Corporate debt securities |  |  |
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward] |  |  |
Debt securities held-to-maturity, before allowance for credit losses | SFr 158 | 0 |
Archegos Capital Management [Member] |  |  |
Other financial assets, Held At Amortized Cost, Allowance for Credit Losses [Roll Forward] |  |  |
Other financial assets, Current-period provision for expected credit losses |  | SFr (155) | SFr 4,307

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