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Derivatives and hedging activities - Credit derivatives (Details 5) - CHF (SFr) SFr in Billions	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023
Credit Derivatives [Line Items]
Credit protection sold	SFr 160.3	SFr 72.5
Credit protection purchased	148.5	66.1
Other protection purchased	33.9	13.6
Other instruments	9.3	4.2
Total credit derivatives	SFr 352.0	SFr 156.4

X

- Definition

Represents the amount of credit protection related to other derivative instruments.

+ References

No definition available.

+ Details

Name:	cs_CreditDerivativeOtherInstruments
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of credit protection purchased with similar, but not identical underlyings.

+ References

No definition available.

+ Details

Name:	cs_CreditDerivativePurchasedCreditProtectionOther
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents the reconciled total value of credit derivatives including total swap returns.

+ References

No definition available.

+ Details

Name:	cs_DerivativeNotionalAmountIncludingTotalReturnSwaps
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K

+ Details

Name:	us-gaap_CreditDerivativeMaximumExposureUndiscounted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of purchased credit protection expected to cover future payments under the credit risk derivative.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K

+ Details

Name:	us-gaap_CreditDerivativePurchasedCreditProtection
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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