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Assets under management - Change (Details 2) - CHF (SFr) SFr in Billions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Changes in Assets under management |  |
Assets under management at beginning of period | SFr 1,291.5 | SFr 1,611.0
Net new assets/(net asset outflows) | (106.7) | (122.5)
Market movements, interest, dividends and foreign exchange | 17.7 | (169.9)
of which market movements, interest and dividends | 69.8 | (165.9)
of which foreign exchange | (52.1) | (4.0)
Other effects | (26.6) | (27.1)
Assets under management at end of period | SFr 1,175.9 | SFr 1,291.5

X
- Definition Changes in AuM due to foreign exchange-related movements + References No definition available. + Details
Name: | cs_AssetsUnderManagementForeignExchange
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the market value of assets that an investment company manages on behalf of investors, including double counting. + References No definition available. + Details
Name: | cs_AssetsUnderManagementIncludingDoubleCounting
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Changes in AuM due to market movements, interest and dividends. + References No definition available. + Details
Name: | cs_AssetsUnderManagementMarketMovementsInterestDividends
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Changes in AuM due to market movements, interest, dividends and foreign-exchange related movements. + References No definition available. + Details
Name: | cs_AssetsUnderManagementMarketMovementsInterestDividendsAndForeignExchange
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other effects in changes in AuM + References No definition available. + Details
Name: | cs_AssetsUnderManagementOtherEffects
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition This element represents the net amount of money that comes from any new investment by a client, including the assets as a result of double counting. + References No definition available. + Details
Name: | cs_NetNewAssetsOrAssetOutflowsIncludingDoubleCounting
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration