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CECL (Details 9) - CHF (SFr) SFr in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Other financial assets held at amortized cost, past due | SFr 0 | SFr 0
Other financial assets held at amortized cost, total | SFr 1,455 | SFr 1,765

X
- References No definition available. + Details
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Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration