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Assets pledged and collateral (Details) - CHF (SFr) SFr in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023
Assets pledged and collateral |  |
Total assets pledged or assigned as collateral | SFr 63,111 | SFr 105,835
of which encumbered | 25,445 | 8,430
Fair value of collateral received with the right to sell or repledge | 150,198 | 74,354
of which sold or repledged | 75,819 | 23,374
Other information |  |
Cash and securities restricted under foreign banking regulations | 812 | 424
Swiss National Bank required minimum liquidity reserves | SFr 2,258 | SFr 2,041

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

X
- Definition The carrying value, as of the date of each statement of financial position presented, of assets which are owned but pledged or assigned as collateral. + References No definition available. + Details
Name: | cs_AssetsPledgedOrAssignedAsCollateralAtCarryingValue
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of assets pledged or assigned as collateral with the right to sell or repledge by the entity. + References No definition available. + Details
Name: | cs_AssetsPledgedOrAssignedAsCollateralWithRightToSellOrRepledge
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- Definition This element represents the minimum liquidity reserves as required by Swiss National Bank. + References No definition available. + Details
Name: | cs_RequiredMinimumLiquidityReserves
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage under foreign banking regulations. + References No definition available. + Details
Name: | cs_RestrictedCashAndCashEquivalentsForeignBankingRegulations
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of collateral received that has been sold or re-pledged and is owed to the debtor (transferor) upon settlement of the related contractual obligation under which it was received. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-1A + Details
Name: | us-gaap_SecuritiesReceivedAsCollateralAmountRepledgedAndSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration