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Assets pledged and collateral (Details) - CHF (SFr) SFr in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Assets pledged and collateral
Total assets pledged or assigned as collateral	SFr 113,063	SFr 63,111
of which encumbered	14,501	25,445
Fair value of collateral received with the right to sell or repledge	91,345	150,198
of which sold or repledged	SFr 32,009	SFr 75,819

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- References

No definition available.

+ Details

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Namespace Prefix:	cs_
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Balance Type:	na
Period Type:	duration

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- Definition

The carrying value, as of the date of each statement of financial position presented, of assets which are owned but pledged or assigned as collateral.

+ References

No definition available.

+ Details

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Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The carrying value as of the balance sheet date of assets pledged or assigned as collateral with the right to sell or repledge by the entity.

+ References

No definition available.

+ Details

Name:	cs_AssetsPledgedOrAssignedAsCollateralWithRightToSellOrRepledge
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	cs_FairValueOfCollateralReceivedWithRightToSellRepledge
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The fair value of collateral received that has been sold or re-pledged and is owed to the debtor (transferor) upon settlement of the related contractual obligation under which it was received.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

+ Details

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Balance Type:	credit
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