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Guarantees and commitments - Guarantees maturity (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2023	Dec. 31, 2022
Guarantees
Maturity less than 1 year	SFr 8,322	SFr 13,642
Maturity between 1 to 3 years	2,846	4,762
Maturity between 3 to 5 years	968	1,558
Maturity greater than 5 years	1,819	2,530
Total gross amount	13,955	22,492
Total net amount	13,458	21,634
Carrying value	158	240
Collateral received	6,997	9,138
Credit guarantees and similar instruments
Guarantees
Maturity less than 1 year	1,716	2,261
Maturity between 1 to 3 years	859	451
Maturity between 3 to 5 years	33	127
Maturity greater than 5 years	368	471
Total gross amount	2,976	3,310
Total net amount	2,932	3,197
Carrying value	14	22
Collateral received	2,244	2,068
Performance guarantees and similar instruments
Guarantees
Maturity less than 1 year	2,383	4,280
Maturity between 1 to 3 years	1,329	1,750
Maturity between 3 to 5 years	778	729
Maturity greater than 5 years	340	513
Total gross amount	4,830	7,272
Total net amount	4,377	6,527
Carrying value	45	61
Collateral received	2,340	3,778
Derivatives
Guarantees
Maturity less than 1 year	894	2,646
Maturity between 1 to 3 years	33	1,702
Maturity between 3 to 5 years	16	520
Maturity greater than 5 years	6	374
Total gross amount	949	5,242
Total net amount	949	5,242
Carrying value	40	101
Other guarantees
Guarantees
Maturity less than 1 year	3,329	4,455
Maturity between 1 to 3 years	625	859
Maturity between 3 to 5 years	141	182
Maturity greater than 5 years	1,105	1,172
Total gross amount	5,200	6,668
Total net amount	5,200	6,668
Carrying value	59	56
Collateral received	SFr 2,413	SFr 3,292

X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make between one to three years 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_GuaranteeMaturityBetweenOneToThreeYears
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 between three to five years 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_GuaranteeMaturityBetweenThreeToFiveYears
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 greater than five years 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_GuaranteeMaturityGreaterThanFiveYears
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://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ 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://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ Details

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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: