Name:	cs_FundLifeHighEndOfRange
Namespace Prefix:	cs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

For investments that do not have readily determinable fair values, this element represents the portion of the investment that is non-redeemable.

No definition available.

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

For investments that do not have readily determinable fair values, this element represents the portion of the investment that is non-redeemable, and is attributable to non-controlling Interest.

No definition available.

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

This element represents the percentage of the investment subject to annual redemption, with a notice period primarily of more than 60 days.

No definition available.

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

This element represents the percentage of the investment subject to monthly redemption, with a notice period primarily of more than 30 days.

No definition available.

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

This element represents the percentage of the investment subject to on demand redemption, with a notice period of less than 30 days.

No definition available.

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

This element represents the percentage of the investment subject to quarterly redemption, with a notice period primarily of more than 60 days.

No definition available.

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

For investments that do not have readily determinable fair values, this element represents the portion of the investment that is redeemable.

No definition available.

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

For investments that do not have readily determinable fair values, this element represents the portion of the investment that is redeemable, and is attributable to non-controlling Interest.

No definition available.

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

For investments that do not have readily determinable fair values, this element represents the unfunded commitments which may impact the ultimate value realized from the investment, and is attributable to non-controlling Interest.

No definition available.

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

This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Subparagraph (a)

-Paragraph 6A

-URI http://asc.fasb.org/extlink&oid=6925170&loc=SL6742756-110258

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

- Details

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

- Details

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

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=SL6742756-110258