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Guarantees and commitments - Guarantees maturity (Details) - CHF (SFr) SFr in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Guarantees |  |
Maturity less than 1 year | SFr 10,710 | SFr 13,642
Maturity greater than 1 year | 7,502 | 8,850
Total gross amount | 18,212 | 22,492
Total net amount | 17,509 | 21,634
Carrying value | 176 | 240
Collateral received | 7,107 | 9,138
Credit guarantees and similar instruments |  |
Guarantees |  |
Maturity less than 1 year | 1,558 | 2,261
Maturity greater than 1 year | 990 | 1,049
Total gross amount | 2,548 | 3,310
Total net amount | 2,490 | 3,197
Carrying value | 18 | 22
Collateral received | 1,636 | 2,068
Performance guarantees and similar instruments |  |
Guarantees |  |
Maturity less than 1 year | 3,489 | 4,280
Maturity greater than 1 year | 2,310 | 2,992
Total gross amount | 5,799 | 7,272
Total net amount | 5,155 | 6,527
Carrying value | 39 | 61
Collateral received | 2,843 | 3,778
Derivatives |  |
Guarantees |  |
Maturity less than 1 year | 1,966 | 2,646
Maturity greater than 1 year | 2,061 | 2,596
Total gross amount | 4,027 | 5,242
Total net amount | 4,027 | 5,242
Carrying value | 59 | 101
Other guarantees |  |
Guarantees |  |
Maturity less than 1 year | 3,697 | 4,455
Maturity greater than 1 year | 2,141 | 2,213
Total gross amount | 5,838 | 6,668
Total net amount | 5,837 | 6,668
Carrying value | 60 | 56
Collateral received | SFr 2,628 | SFr 3,292

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 https://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 https://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: |