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FI - Roll-forward of net assets measured at fair value on recurring basis (Details 7) - Recurring basis - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net assets/liabilities measured at fair value on a recurring basis for level 3
Balance at beginning of period, net assets/liabilities	SFr (3,865)	SFr 2,329
Transfers in, net assets/liabilities	(2,110)	(4,083)
Transfers out, net assets/liabilities	6,150	4,098
Purchases, net assets/liabilities	6,332	10,119
Sales, net assets/liabilities	(5,834)	(9,666)
Issuances, net assets/liabilities	(8,279)	(13,139)
Settlements, net assets/liabilities	6,447	6,052
Gain (loss) on transfers in/out included in trading revenues, net assets/liabilities	666	(389)
Gain (loss) on all other activity included in trading revenues, net assets/liabilities	(94)	705
Gain (loss) on transfers in/out included in other revenues, net assets/liabilities	46	(113)
Gain (loss) on all other activity included in other revenues, net assets/liabilities	(70)	160
Gain (loss) on transfers in/out included in accumulated other comprehensive income, net assets/liabilities	51	0
Gain (loss) on all other activity included in accumulated other comprehensive income, net assets/liabilities	407	64
Foreign currency translation impact, net assets/liabilities	(31)	(2)
Balance at beginning of period, net assets/liabilities	(184)	(3,865)
Other Comprehensive Income (Loss) [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	413	3
Trading Revenue [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	(472)	(841)
Other Revenue [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	(50)	82
Net Revenue [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	(109)	(756)
Bank
Net assets/liabilities measured at fair value on a recurring basis for level 3
Balance at beginning of period, net assets/liabilities	(3,864)	2,332
Transfers in, net assets/liabilities	(2,138)	(4,083)
Transfers out, net assets/liabilities	6,150	4,101
Purchases, net assets/liabilities	6,332	10,115
Sales, net assets/liabilities	(5,833)	(9,661)
Issuances, net assets/liabilities	(8,279)	(13,139)
Settlements, net assets/liabilities	6,447	6,044
Gain (loss) on transfers in/out included in trading revenues, net assets/liabilities	666	(391)
Gain (loss) on all other activity included in trading revenues, net assets/liabilities	(94)	713
Gain (loss) on transfers in/out included in other revenues, net assets/liabilities	46	(109)
Gain (loss) on all other activity included in other revenues, net assets/liabilities	(70)	155
Gain (loss) on transfers in/out included in accumulated other comprehensive income, net assets/liabilities	51	0
Gain (loss) on all other activity included in accumulated other comprehensive income, net assets/liabilities	407	63
Foreign currency translation impact, net assets/liabilities	(31)	(4)
Balance at beginning of period, net assets/liabilities	(210)	(3,864)
Bank | Other Comprehensive Income (Loss) [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	413	2
Bank | Trading Revenue [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	(472)	(841)
Bank | Other Revenue [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	(50)	82
Bank | Net Revenue [Member]
Net assets/liabilities measured at fair value on a recurring basis for level 3
Changes in unrealized gains/losses	SFr (109)	SFr (757)

X

- Definition

This element represents the impact of foreign currency translation on the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

X

- Definition

This element represents the amount of the total gains or losses for the period which are included in the statement of income other revenues, related to all other activity other than transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

+ References

No definition available.

+ Details

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- Definition

This element represents the amount of the total gains or losses for the period which are included in the statement of income included in trading revenues, related to all other activity other than transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesGainLossOnTransfersInOutIncludedInAccumulatedOtherComprehensiveIncome
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents the amount of the total gains or losses for the period which are included in the statement of income in other revenues, related to transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

+ References

No definition available.

+ Details

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Namespace Prefix:	cs_
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X

- Definition

This element represents the amount of the total gains or losses for the period which are included in the statement of income in trading revenues, related to transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3).

+ References

No definition available.

+ Details

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

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- Definition

Issues that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesIssues
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Purchases that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesPurchases
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sales that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesSales
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Settlements that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesSettlements
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This element represents transfers in to net assets/liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

No definition available.

+ Details

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesTransfersIn
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents transfers out of net assets/liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

No definition available.

+ Details

Name:	cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesTransfersOut
Namespace Prefix:	cs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This element represents the net assets/liabilities measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	cs_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix:	cs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of unrealized gain (loss) recognized in income from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_TradingRevenueMember
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- Details

Name:	us-gaap_IncomeStatementLocationAxis=cs_OtherRevenueMember
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- Details

Name:	us-gaap_IncomeStatementLocationAxis=cs_NetRevenueMember
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- Details

Name:	dei_LegalEntityAxis=cs_ConsolidatedBankMember
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