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CECL (Details 16) - CHF (SFr) SFr in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Other financial assets, held at amortized cost, Allowance for Credit Loss [Line Items] |  |
Purchases | SFr 931 | SFr 196

X
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Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | cs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration