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CECL (Details 12) - CHF (SFr) SFr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items] |  |  |
Origination in current year | SFr 0 | SFr 0 |
Origination in current year-1 | 7 | 7 |
Origination in current year-2 | 0 | 0 |
Origination in current year-3 | 0 | 0 |
Origination in current year-4 | 0 | 47 |
Origination 5 years or more | 0 | 0 |
Total term positions | 7 | 54 |
Revolving positions | 1,264 | 1,711 |
Other financial assets held at amortized cost, total | 1,271 | 1,765 |
Other financial assets, Gross write-offs | (4,035) | (7) | SFr (8)
Origination In Current Year |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Origination In Current Year -1 |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Origination In Current Year -2 |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Origination In Current Year -3 |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Origination In Current Year -4 |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Origination In Current Year -5 or more |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Total term positions |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Revolving positions |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Financing receivable, before Allowance for Credit Loss and Fee |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Other financial assets, Gross write-offs | 0 |  |
Investment grade | AAA to BBB |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Origination in current year | 0 | 0 |
Origination in current year-1 | 0 | 0 |
Origination in current year-2 | 0 | 0 |
Origination in current year-3 | 0 | 0 |
Origination in current year-4 | 0 | 0 |
Origination 5 years or more | 0 | 0 |
Total term positions | 0 | 0 |
Revolving positions | 0 | 0 |
Other financial assets held at amortized cost, total | 0 | 0 |
Non-investment grade | BB to C |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Origination in current year | 0 | 0 |
Origination in current year-1 | 7 | 7 |
Origination in current year-2 | 0 | 0 |
Origination in current year-3 | 0 | 0 |
Origination in current year-4 | 0 | 47 |
Origination 5 years or more | 0 | 0 |
Total term positions | 7 | 54 |
Revolving positions | 1,264 | 1,711 |
Other financial assets held at amortized cost, total | 1,271 | 1,765 |
Non-investment grade | D |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Origination in current year | 0 | 0 |
Origination in current year-1 | 0 | 0 |
Origination in current year-2 | 0 | 0 |
Origination in current year-3 | 0 | 0 |
Origination in current year-4 | 0 | 0 |
Origination 5 years or more | 0 | 0 |
Total term positions | 0 | 0 |
Revolving positions | 0 | 0 |
Other financial assets held at amortized cost, total | SFr 0 | SFr 0 |

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