Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesForeignCurrencyTranslationImpact
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesGainLossOnAllOtherActivityIncludedInAccumulatedOtherComprehensiveIncome
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of the total gains or losses for the period which are included in the statement of income other revenues, related to all other activity other than transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesGainLossOnAllOtherActivityIncludedInOtherRevenues
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of the total gains or losses for the period which are included in the statement of income included in trading revenues, related to all other activity other than transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesGainLossOnAllOtherActivityIncludedInTradingRevenues
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesGainLossOnTransfersInOutIncludedInAccumulatedOtherComprehensiveIncome
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of the total gains or losses for the period which are included in the statement of income in other revenues, related to transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesGainLossOnTransfersInOutIncludedInOtherRevenues
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the amount of the total gains or losses for the period which are included in the statement of income in trading revenues, related to transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesGainLossOnTransfersInOutIncludedInTradingRevenues
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Issues that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesIssues
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Purchases that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesPurchases
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Sales that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesSales
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Settlements that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesSettlements
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This element represents transfers in to net assets/liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesTransfersIn
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents transfers out of net assets/liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

No definition available.

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesTransfersOut
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This element represents the net assets/liabilities measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

No definition available.

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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

Amount of unrealized gain (loss) recognized in income from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Name:	us-gaap_FairValueAssetLiabilityRecurringBasisStillHeldUnrealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
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Name:	us-gaap_OtherComprehensiveIncomeLocationAxis=us-gaap_OtherComprehensiveIncomeMember
Namespace Prefix:
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Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_TradingRevenueMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_IncomeStatementLocationAxis=cs_OtherRevenueMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_IncomeStatementLocationAxis=cs_NetRevenueMember
Namespace Prefix:
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