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Derivatives and hedging activities - Credit derivatives (Details 5) - CHF (SFr) SFr in Billions | 6 Months Ended
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Jun. 30, 2023 | Dec. 31, 2022
Credit Derivatives [Line Items] |  |
Credit protection sold | SFr 124.2 | SFr 160.3
Credit protection purchased | 115.6 | 148.5
Other protection purchased | 16.8 | 33.9
Other instruments | 4.1 | 9.3
Total credit derivatives | SFr 260.7 | SFr 352.0

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + 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