Fair Value Measurements - Gross components of purchases, sales, issuances and settlements (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	$ 3,452	$ 1,094	$ 8,852	$ 3,015
Sales	(1,080)	(59)	(1,274)	(128)
Issuances and Settlements	(1,266)	(540)	(3,250)	(1,308)
Purchases, Sales, Issuances and Settlements, Net	1,106	495	4,328	1,579
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	(28)	0	(229)
Sales	420	348	1,144	1,076
Issuances and Settlements	(332)	(383)	(1,076)	(1,410)
Purchases, Sales, Issuances and Settlements, Net	88	(63)	68	(563)
Policyholder contract deposits
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0	0	0
Sales	420	348	1,144	1,076
Issuances and Settlements	(320)	(118)	(674)	(210)
Purchases, Sales, Issuances and Settlements, Net	100	230	470	866
Derivative liabilities, net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	(28)	0	(229)
Sales	0	0	0	0
Issuances and Settlements	69	(88)	(110)	(311)
Purchases, Sales, Issuances and Settlements, Net	69	(116)	(110)	(540)
Fortitude Re funds withheld payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances and Settlements	(81)	(177)	(292)	(882)
Purchases, Sales, Issuances and Settlements, Net	(81)	(177)	(292)	(882)
Debt of consolidated investment entities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases		0		0
Sales		0		0
Issuances and Settlements		0		(7)
Purchases, Sales, Issuances and Settlements, Net		0		(7)
Bonds available-for-sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	3,187	895	8,215	2,450
Sales	(1,040)	(49)	(1,232)	(118)
Issuances and Settlements	(1,185)	(449)	(2,940)	(992)
Purchases, Sales, Issuances and Settlements, Net	962	397	4,043	1,340
Bonds available-for-sale \| Obligations of states, municipalities and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	12	0	12	0
Sales	(12)	(12)	(12)	(12)
Issuances and Settlements	0	0	(1)	(3)
Purchases, Sales, Issuances and Settlements, Net	0	(12)	(1)	(15)
Bonds available-for-sale \| Corporate debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	300	192	369	222
Sales	(271)	(30)	(279)	(30)
Issuances and Settlements	(75)	(175)	(206)	(232)
Purchases, Sales, Issuances and Settlements, Net	(46)	(13)	(116)	(40)
Bonds available-for-sale \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	405	175	1,444	406
Sales	(191)	0	(240)	(42)
Issuances and Settlements	(234)	(188)	(612)	(559)
Purchases, Sales, Issuances and Settlements, Net	(20)	(13)	592	(195)
Bonds available-for-sale \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	48	0	57	9
Sales	(62)	0	(92)	(27)
Issuances and Settlements	(13)	(2)	(119)	(24)
Purchases, Sales, Issuances and Settlements, Net	(27)	(2)	(154)	(42)
Bonds available-for-sale \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	837	18	1,057	100
Sales	(151)	(7)	(153)	(7)
Issuances and Settlements	(360)	(51)	(500)	(178)
Purchases, Sales, Issuances and Settlements, Net	326	(40)	404	(85)
Bonds available-for-sale \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	1,585	510	5,276	1,713
Sales	(353)	0	(456)	0
Issuances and Settlements	(503)	(33)	(1,502)	4
Purchases, Sales, Issuances and Settlements, Net	729	477	3,318	1,717
Other bond securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	127	124	403	314
Sales	(40)	(10)	(40)	(10)
Issuances and Settlements	(73)	(89)	(171)	(301)
Purchases, Sales, Issuances and Settlements, Net	14	25	192	3
Other bond securities \| Obligations of states, municipalities and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0	0	3
Sales	0	(2)	0	(2)
Issuances and Settlements	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	0	(2)	0	1
Other bond securities \| Corporate debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	89	10	156
Sales	0	0	0	0
Issuances and Settlements	0	(24)	0	(207)
Purchases, Sales, Issuances and Settlements, Net	0	65	10	(51)
Other bond securities \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0	0	6
Sales	0	0	0	0
Issuances and Settlements	(1)	(2)	(7)	(9)
Purchases, Sales, Issuances and Settlements, Net	(1)	(2)	(7)	(3)
Other bond securities \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0	0	0
Sales	(4)	0	(4)	0
Issuances and Settlements	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(4)	0	(4)	0
Other bond securities \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	8	0	17	1
Sales	0	0	0	0
Issuances and Settlements	0	(3)	(16)	(50)
Purchases, Sales, Issuances and Settlements, Net	8	(3)	1	(49)
Other bond securities \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	119	35	376	148
Sales	(36)	(8)	(36)	(8)
Issuances and Settlements	(72)	(60)	(148)	(35)
Purchases, Sales, Issuances and Settlements, Net	11	(33)	192	105
Equity securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	1	7	26
Sales	0	0	(2)	0
Issuances and Settlements	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	0	1	5	26
Other invested assets
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	138	74	227	225
Sales	0	0	0	0
Issuances and Settlements	(8)	(2)	(139)	(15)
Purchases, Sales, Issuances and Settlements, Net	$ 130	$ 72	$ 88	$ 210

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets

No definition available.

Name:	crbg_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAssetsAbstract
Namespace Prefix:	crbg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities

+ References

No definition available.

+ Details

Name:	crbg_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLiabilitiesAbstract
Namespace Prefix:	crbg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 101
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-101

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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

- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Definition

Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

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

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=crbg_PolicyholderContractDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=crbg_FundsHeldUnderReinsuranceAgreementsLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=crbg_DebtSecuritiesAvailableForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedLoanObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=crbg_DebtSecuritiesFixedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=crbg_OtherInvestedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: