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

Maximum potential amount of future payments (undiscounted) the entity could be required to make after one year of the balance sheet date under the commitment agreement (or each group of similar commitment agreements) before reduction for potential recoveries under recourse or collateralization provisions.

No definition available.

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

Maximum potential amount of future payments (undiscounted) the entity could be required to make within one year of the balance sheet date under the commitment agreement (or each group of similar commitment agreements) before reduction for potential recoveries under recourse or collateralization provisions.

No definition available.

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

Maximum potential amount of future payments (undiscounted) the entity could be required to make under the commitment agreement (or each group of similar commitment agreements) before reduction for potential recoveries under recourse or collateralization provisions.

No definition available.

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

Maximum potential amount of future payments (undiscounted) the entity could be required to make under the commitment agreement (or each group of similar commitment agreements) after reduction for potential recoveries under recourse or collateralization provisions.

No definition available.

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

Represents the unused credit limits under the commitment agreement, which are revocable at the discretion of the reporting entity upon notice to client.

No definition available.

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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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

Name:	us-gaap_OtherCommitmentsAxis=cs_IrrevocableCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_OtherCommitmentsAxis=cs_LoanCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_OtherCommitmentsAxis=cs_ForwardReverseRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_OtherCommitmentsAxis=cs_OtherCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: