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Revenue from contracts with customers (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	SFr 4,690	SFr 7,479	SFr 11,353
Other securities business [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	67	61	61
Underwriting [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	90	560	2,560
Brokerage [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,280	2,264	3,087
Investment Advice [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,478	3,028	3,401
Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	SFr 775	SFr 1,566	SFr 2,244

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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