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Business developments - Subsequent events (Details 4) $ in Millions, SFr in Billions | Mar. 27, 2024 USD ($) | Mar. 22, 2024 CHF (SFr) | Dec. 31, 2023 CHF (SFr)
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Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Senior secured asset-based financing transferred to Apollo | $ 8,000 |  |
Swingline facility under the transferred financing facilities to Apollo | 750 |  |
Expected net loss from conclusion of investment management agreement and assignment of the loan facilities | $ 900 |  |
Liquidity matters [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Emergency Liquidity Assistance | SFr |  |  | SFr 38
Liquidity matters [Member] | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Emergency Liquidity Assistance | SFr |  | SFr 19 |

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