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Guarantees and commitments - Other guarantees (Details 2) - CHF (SFr) SFr in Billions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2024 | Jun. 30, 2024
Guarantees |  |  |
Amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland |  | SFr 6.0 |
Deposit Insurance Guarantee Scheme, Amount Guaranteed, Percentage |  | 1.60% |
Group's share in amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland | SFr 0.6 |  | SFr 0.6

X
- Definition Represents the amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland under deposit insurance guarantee scheme. + References No definition available. + Details
Name: | cs_DepositInsuranceGuaranteeSchemeAmountGuaranteed
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | cs_DepositInsuranceGuaranteeSchemeAmountGuaranteedPercentage
Namespace Prefix: | cs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the share of reporting entity in the total amount jointly guaranteed by deposit-taking banks and securities dealers in Switzerland in deposit insurance guarantee scheme. + References No definition available. + Details
Name: | cs_DepositInsuranceGuaranteeSchemeShareOfEntityInAmountGuaranteed
Namespace Prefix: | cs_
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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration