Financial instruments (Details 8) (Nonrecurring basis, CHF) In Billions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Total - at fair value
Assets and liabilities recorded at fair value
Loans	0.7	0.6
Level 2
Assets and liabilities recorded at fair value
Loans	0	0.1
Level 3
Assets and liabilities recorded at fair value
Loans	0.7	0.5

Reflects the aggregate carrying amount of all categories of loans held in portfolio, net of unearned income and the allowance for losses on loans and leases that are measured at fair value on a nonrecurring basis.

No definition available.

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