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Derivatives and hedging activities - Credit derivatives (Details 5) - CHF (SFr) SFr in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023
Credit Derivatives [Line Items] |  |
Credit protection sold | SFr 160.3 | SFr 72.5
Credit protection purchased | 148.5 | 66.1
Other protection purchased | 33.9 | 13.6
Other instruments | 9.3 | 4.2
Total credit derivatives | SFr 352.0 | SFr 156.4

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- Definition Represents the amount of credit protection related to other derivative instruments. + References No definition available. + Details
Name: | cs_CreditDerivativeOtherInstruments
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of credit protection purchased with similar, but not identical underlyings. + References No definition available. + Details
Name: | cs_CreditDerivativePurchasedCreditProtectionOther
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the reconciled total value of credit derivatives including total swap returns. + References No definition available. + Details
Name: | cs_DerivativeNotionalAmountIncludingTotalReturnSwaps
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K + Details
Name: | us-gaap_CreditDerivativeMaximumExposureUndiscounted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of purchased credit protection expected to cover future payments under the credit risk derivative. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K + Details
Name: | us-gaap_CreditDerivativePurchasedCreditProtection
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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_CreditDerivativesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration