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Guarantees and commitments - Other commitments maturity (Details 7) - CHF (SFr) SFr in Millions	Jun. 30, 2023	Dec. 31, 2022
Other commitments
Maturity less than 1 year	SFr 18,759	SFr 23,883
Maturity greater than 1 year	69,380	93,185
Total gross amount	88,139	117,068
Total net amount	84,399	112,870
Irrevocable commitments under documentary credits
Other commitments
Maturity less than 1 year	2,910	3,378
Maturity greater than 1 year	26	42
Total gross amount	2,936	3,420
Total net amount	2,852	3,233
Loan commitments
Other commitments
Maturity less than 1 year	12,982	19,272
Maturity greater than 1 year	69,115	92,857
Total gross amount	82,097	112,129
Total net amount	78,441	108,118
Unused revocable credit limits	112,275	129,224
Forward reverse repurchase agreements
Other commitments
Maturity less than 1 year	2,686	1,021
Maturity greater than 1 year	0	0
Total gross amount	2,686	1,021
Total net amount	2,686	1,021
Other commitments
Other commitments
Maturity less than 1 year	181	212
Maturity greater than 1 year	239	286
Total gross amount	420	498
Total net amount	SFr 420	SFr 498

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: