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

The average maturity of the commercial paper outstanding, expressed in days.

No definition available.

Name:	cs_CommercialPaperMaturityPeriodAverage
Namespace Prefix:	cs_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The average maturity of the conduit's assets as of the balance sheet date, expressed in years.

No definition available.

Name:	cs_ConduitAssetsMaturityPeriodAverage
Namespace Prefix:	cs_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

For retail deposits, the carrying amount of the variable interest entity's liabilities consolidated into the balance sheet.

No definition available.

Name:	cs_DepositsRetailReportedFromConsolidatedVIEs
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For Federal Funds sold and securities borrowed or purchased under agreements to resell, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

For loans held-for-sale, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

For loans receivable, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

For long-term debt, the carrying amount of the variable interest entity's liabilities consolidated into the balance sheet.

No definition available.

Name:	cs_LongTermDebtReportedFromConsolidatedVIEs
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For marketable securities, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

Represents the minimum percentage of outstanding issuances held in a variable interest entity by the reporting entity for determining whether the entity is primary beneficiary or not.

No definition available.

Name:	cs_MinimumPercentageOfOutstandingIssuancesHeldForDeterminingWhetherEnterpriseIsPrimaryBeneficiary
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The reported amount of the total assets of variable interest entities that are not consolidated in the financial statements of the entity.

No definition available.

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

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

Represents the number of categories in which variable interest entities are broadly grouped.

No definition available.

Name:	cs_NumberOfCategoriesOfVariableInterestEntities
Namespace Prefix:	cs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

This element represents, for other assets, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

For other investments, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

For other liabilities, the carrying amount of the variable interest entity's liabilities consolidated into the balance sheet.

No definition available.

Name:	cs_OtherLiabilitiesReportedFromConsolidatedVIEs
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For property, plant and equipment, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

For short-term borrowings, the carrying amount of the variable interest entity's liabilities consolidated into the balance sheet.

No definition available.

Name:	cs_ShortTermBorrowingsReportedFromConsolidatedVIEs
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For trading liabilities, the carrying amount of the variable interest entity's liabilities consolidated into the balance sheet.

No definition available.

Name:	cs_TradingLiabilitiesReportedFromConsolidatedVIEs
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For trading securities, the carrying amount of the variable interest entity's assets consolidated into the balance sheet.

No definition available.

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

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

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

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

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

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

The carrying amount of the loans receivable in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

No definition available.

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

The carrying amount of the other assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

No definition available.

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

The carrying amount of the trading securities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

No definition available.

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

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5710-111685

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46(R)

-Paragraph C6

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5747-111685

Name:	us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).