Name:	cs_DefinedBenefitPlanCashAndCashEquivalents
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The percentage of the fair value of alternative investments (including private equity investments, publicly traded investments that are restricted or not quoted in active markets and hedge funds not directly quoted on a public stock exchange and/or for which a fair value is not readily determinable) to the fair value of total plan assets held as of the measurement date.

No definition available.

Name:	cs_DefinedBenefitPlanOtherPlanAssetsAlternativeInvestments
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Target allocation percentage of investments in cash and cash equivalents to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

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

Target allocation percentage of investments in insurance to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

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

Target allocation percentage of investments in alternative investments (including private equity investments, publicly traded investments that are restricted or not quoted in active markets and hedge funds not directly quoted on a public stock exchange and/or for which a fair value is not readily determinable) to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

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

The target aggregate allocation percentage of investments (categorized by debt securities, equity securities, real estate and other plan assets) to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

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

- Details

Name:	us-gaap_DefinedBenefitPlanAssetsTargetAllocationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(1)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

The percentage of the fair value of equity securities to the fair value of total plan assets held as of the measurement date.

Name:	us-gaap_DefinedBenefitPlanEquitySecurities
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date.

Name:	us-gaap_DefinedBenefitPlanOtherPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

The percentage of the fair value of real estate to the fair value of total plan assets held as of the measurement date.

Name:	us-gaap_DefinedBenefitPlanRealEstate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(2)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Target allocation percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Target allocation percentage of investments in real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsRealEstate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The aggregate percentage of the fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date.