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Assets under management (Details) - CHF (SFr) SFr in Billions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets under management [Line Items]
Assets in collective investment instruments managed by Credit Suisse	SFr 175.1	SFr 194.6
Assets with discretionary mandates	215.2	244.1
Other assets under management	785.6	852.8
Assets under management (including double counting)	1,175.9	1,291.5	SFr 1,611.0
of which double counting	SFr 23.8	SFr 31.9

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Name:	cs_AssetsUnderManagementDisclosureLineItems
Namespace Prefix:	cs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

This element represents the portion of assets under management that result from double counting. Double counting arises when assets under management are subject to more than one level of asset management services.

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No definition available.

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Name:	cs_AssetsUnderManagementDoubleCounting
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

This element represents the assets in collective investments instruments managed by the reporting entity.

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Name:	cs_AssetsUnderManagementInCollectiveInvestmentInstruments
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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.

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No definition available.

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Name:	cs_AssetsUnderManagementIncludingDoubleCounting
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

This element represents the assets with discretionary mandates managed by the reporting entity.

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Name:	cs_AssetsUnderManagementWithDiscretionaryMandates
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

This element represents other assets under management managed by the reporting entity.

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No definition available.

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Name:	cs_OtherAssetsUnderManagement
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant