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Guarantees and commitments - Other commitments maturity (Details 7) - CHF (SFr) SFr in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Other commitments |  |
Maturity less than 1 year | SFr 29,767 | SFr 28,342
Maturity greater than 1 year | 97,510 | 99,991
Total gross amount | 127,277 | 128,333
Total net amount | 122,982 | 123,745
Collateral received | 57,516 | 59,041
Unused revocable credit limits | 139,405 | 143,992
Irrevocable commitments under documentary credits |  |
Other commitments |  |
Maturity less than 1 year | 5,069 | 4,796
Maturity greater than 1 year | 41 | 116
Total gross amount | 5,110 | 4,912
Total net amount | 4,781 | 4,602
Collateral received | 3,153 | 2,801
Loan commitments |  |
Other commitments |  |
Maturity less than 1 year | 24,326 | 22,959
Maturity greater than 1 year | 97,182 | 99,600
Total gross amount | 121,508 | 122,559
Total net amount | 117,542 | 118,281
Collateral received | 54,120 | 55,766
Forward reverse repurchase agreements |  |
Other commitments |  |
Maturity less than 1 year | 239 | 466
Maturity greater than 1 year | 0 | 0
Total gross amount | 239 | 466
Total net amount | 239 | 466
Collateral received | 239 | 466
Other commitments |  |
Other commitments |  |
Maturity less than 1 year | 133 | 121
Maturity greater than 1 year | 287 | 275
Total gross amount | 420 | 396
Total net amount | 420 | 396
Collateral received | 4 | 8
Bank |  |
Other commitments |  |
Maturity less than 1 year | 29,767 | 28,342
Maturity greater than 1 year | 97,510 | 99,991
Total gross amount | 127,277 | 128,333
Total net amount | 122,982 | 123,745
Collateral received | 57,516 | 59,041
Bank | Irrevocable commitments under documentary credits |  |
Other commitments |  |
Maturity less than 1 year | 5,069 | 4,796
Maturity greater than 1 year | 41 | 116
Total gross amount | 5,110 | 4,912
Total net amount | 4,781 | 4,602
Collateral received | 3,153 | 2,801
Bank | Loan commitments |  |
Other commitments |  |
Maturity less than 1 year | 24,326 | 22,959
Maturity greater than 1 year | 97,182 | 99,600
Total gross amount | 121,508 | 122,559
Total net amount | 117,542 | 118,281
Collateral received | 54,120 | 55,766
Unused revocable credit limits | 139,485 | 144,079
Bank | Forward reverse repurchase agreements |  |
Other commitments |  |
Maturity less than 1 year | 239 | 466
Maturity greater than 1 year | 0 | 0
Total gross amount | 239 | 466
Total net amount | 239 | 466
Collateral received | 239 | 466
Bank | Other commitments |  |
Other commitments |  |
Maturity less than 1 year | 133 | 121
Maturity greater than 1 year | 287 | 275
Total gross amount | 420 | 396
Total net amount | 420 | 396
Collateral received | SFr 4 | SFr 8

X
- Definition The carrying value, as of the balance sheet date, of any assets received as collateral that, upon the occurrence of any triggering event or condition under the commitment agreement, the entity can obtain and liquidate to recover all or a portion of the amounts paid under the commitment agreement. + References No definition available. + Details
Name: | cs_CommitmentObligationsCollateralReceived
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | cs_CommitmentObligationsMaturityGreaterThanOneYear
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | cs_CommitmentObligationsMaturityLessThanOneYear
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | cs_CommitmentObligationsMaximumExposureGross
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | cs_CommitmentObligationsMaximumExposureNet
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the unused credit limits under the commitment agreement, which are revocable at the discretion of the reporting entity upon notice to client. + References No definition available. + Details
Name: | cs_CommitmentObligationsUnusedRevocableCreditLimit
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

X
- Details
Name: | dei_LegalEntityAxis=cs_ConsolidatedBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |