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

The threshold for percentage voting rights held by the reporting entity in its consolidated subsidiaries.

No definition available.

Name:	cs_ConsolidationPercentageThreshold
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The threshold percentage in excess of the greater of the projected benefit obligation or market value of plan assets which is amortized to net periodic pension and other post-retirement cost.

No definition available.

Name:	cs_DefinedBenefitPlanAmortizationOfGainsLossesThresholdPercentage
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The period of time beyond the contract date during which a hedge is carried at fair value when the forecasted transaction is not probable of occurrence.

No definition available.

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

The number of Loan portfolio segments.

No definition available.

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

The threshold percentage by which an equity security has declined below cost that is used by the reporting entity for determining that a loss is other-than-temporary, expressed as a percentage.

No definition available.

Name:	cs_OtherThanTemporaryImpairmentEquitySecuritiesLossPercentageThreshold
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The threshold period of time in which an equity security has unrealized losses that is used by the reporting entity for determining that a loss is other-than-temporary, expressed in months.

No definition available.

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

The high end of the range of the required percentage voting interest to be held by the reporting entity to use the equity method of accounting to report investments in its consolidated financial statements.

No definition available.

Name:	cs_PercentageOfInterestHeldForEquityMethodInvestmentsHighEndOfRange
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The threshold percentage voting interest of limited partnership interests to be held by the reporting entity to use the equity method of accounting to report investments in its consolidated financial statements.

No definition available.

Name:	cs_PercentageOfInterestHeldForEquityMethodInvestmentsLimitedPartnershipsThreshold
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The low end of the range of the required percentage voting interest to be held by the reporting entity to use the equity method of accounting to report investments in its consolidated financial statements.

No definition available.

Name:	cs_PercentageOfInterestHeldForEquityMethodInvestmentsLowEndOfRange
Namespace Prefix:	cs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The high end of the range of the useful life of real estate held for investment purposes, expressed in years.

No definition available.

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

The low end of the range of the useful life of real estate held for investment purposes, expressed in years.

No definition available.

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

- Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

No definition available.