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Guarantees and commitments - Guarantees maturity (Details) - CHF (SFr) SFr in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Guarantees |  |
Maturity less than 1 year | SFr 17,299 | SFr 15,492
Maturity greater than 1 year | 9,410 | 11,188
Total gross amount | 26,709 | 26,680
Total net amount | 25,347 | 25,563
Carrying value | 285 | 425
Collateral received | 9,663 | 9,408
Credit guarantees and similar instruments |  |
Guarantees |  |
Maturity less than 1 year | 2,306 | 2,124
Maturity greater than 1 year | 1,494 | 1,807
Total gross amount | 3,800 | 3,931
Total net amount | 3,722 | 3,874
Carrying value | 25 | 25
Collateral received | 2,070 | 2,014
Performance guarantees and similar instruments |  |
Guarantees |  |
Maturity less than 1 year | 4,826 | 3,982
Maturity greater than 1 year | 3,061 | 3,336
Total gross amount | 7,887 | 7,318
Total net amount | 6,613 | 6,299
Carrying value | 44 | 40
Collateral received | 3,943 | 3,605
Derivatives |  |
Guarantees |  |
Maturity less than 1 year | 5,884 | 5,374
Maturity greater than 1 year | 2,634 | 3,547
Total gross amount | 8,518 | 8,921
Total net amount | 8,518 | 8,921
Carrying value | 145 | 289
Other guarantees |  |
Guarantees |  |
Maturity less than 1 year | 4,283 | 4,012
Maturity greater than 1 year | 2,221 | 2,498
Total gross amount | 6,504 | 6,510
Total net amount | 6,494 | 6,469
Carrying value | 71 | 71
Collateral received | 3,650 | 3,789
Bank |  |
Guarantees |  |
Maturity less than 1 year | 17,303 | 15,492
Maturity greater than 1 year | 9,435 | 11,188
Total gross amount | 26,738 | 26,680
Total net amount | 25,376 | 25,563
Carrying value | 285 | 425
Collateral received | 9,663 | 9,408
Bank | Credit guarantees and similar instruments |  |
Guarantees |  |
Maturity less than 1 year | 2,310 | 2,124
Maturity greater than 1 year | 1,491 | 1,807
Total gross amount | 3,801 | 3,931
Total net amount | 3,723 | 3,874
Carrying value | 25 | 25
Collateral received | 2,070 | 2,014
Bank | Performance guarantees and similar instruments |  |
Guarantees |  |
Maturity less than 1 year | 4,826 | 3,982
Maturity greater than 1 year | 3,061 | 3,336
Total gross amount | 7,887 | 7,318
Total net amount | 6,613 | 6,299
Carrying value | 44 | 40
Collateral received | 3,943 | 3,605
Bank | Derivatives |  |
Guarantees |  |
Maturity less than 1 year | 5,884 | 5,374
Maturity greater than 1 year | 2,634 | 3,547
Total gross amount | 8,518 | 8,921
Total net amount | 8,518 | 8,921
Carrying value | 145 | 289
Bank | Other guarantees |  |
Guarantees |  |
Maturity less than 1 year | 4,283 | 4,012
Maturity greater than 1 year | 2,249 | 2,498
Total gross amount | 6,532 | 6,510
Total net amount | 6,522 | 6,469
Carrying value | 71 | 71
Collateral received | SFr 3,650 | SFr 3,789

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make after one year of the balance sheet date under the guarantee (or each group of similar guarantees) before reduction for potential recoveries under recourse or collateralization provisions. + References No definition available. + Details
Name: | cs_GuaranteeMaturityGreaterThanOneYear
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make within one year of the balance sheet date under the guarantee (or each group of similar guarantees) before reduction for potential recoveries under recourse or collateralization provisions. + References No definition available. + Details
Name: | cs_GuaranteeMaturityLessThanOneYear
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 guarantee, the guarantor can obtain and liquidate to recover all or a portion of the amounts paid under the guarantee. + References No definition available. + Details
Name: | cs_GuaranteeObligationsCollateralReceived
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees after reduction for potential recoveries under recourse or collateralization provisions and participations if any. + References No definition available. + Details
Name: | cs_GuaranteeObligationsMaximumExposureNet
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_PaymentGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_PerformanceGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=cs_DerivativeGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_GuaranteeTypeOtherMember
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: |