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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)
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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- References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

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