Separate Account Assets and Liabilities - Separate account liabilities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	$ 95,585	$ 93,888
Premiums and deposits	772	732
Policy charges	(449)	(454)
Surrenders and withdrawals	(2,674)	(2,428)
Benefit payments	(429)	(400)
Investment performance	(2,186)	(2,182)
Net transfers from (to) general account and other	(99)	(86)
balance, end of period	90,520	89,070
Cash surrender value	89,658	88,102
Group Retirement
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	40,701	39,672
Premiums and deposits	337	358
Policy charges	(118)	(116)
Surrenders and withdrawals	(1,165)	(1,024)
Benefit payments	(154)	(164)
Investment performance	(960)	(1,238)
Net transfers from (to) general account and other	(123)	(108)
balance, end of period	38,518	37,380
Cash surrender value	38,434	37,288
Life Insurance
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	1,149	1,059
Premiums and deposits	8	8
Policy charges	(11)	(12)
Surrenders and withdrawals	(8)	(12)
Benefit payments	(2)	(3)
Investment performance	(42)	(44)
Net transfers from (to) general account and other	(2)	0
balance, end of period	1,092	996
Cash surrender value	1,074	976
Institutional Markets
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	4,957	4,339
Premiums and deposits	20	32
Policy charges	(27)	(27)
Surrenders and withdrawals	(54)	(78)
Benefit payments	(10)	(3)
Investment performance	67	14
Net transfers from (to) general account and other	3	5
balance, end of period	4,956	4,282
Cash surrender value	4,956	4,284
Corporate & Other
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	48,778	48,818
Premiums and deposits	407	334
Policy charges	(293)	(299)
Surrenders and withdrawals	(1,447)	(1,314)
Benefit payments	(263)	(230)
Investment performance	(1,251)	(914)
Net transfers from (to) general account and other	23	17
balance, end of period	45,954	46,412
Cash surrender value	$ 45,194	$ 45,554

Transfer to (from) Policyholder Account Balance (to) from General Account

No definition available.

Name:	crbg_TransferToFromPolicyholderAccountBalanceToFromGeneralAccount
Namespace Prefix:	crbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow to separate account policyholder from benefit payment.

+ References

+ Details

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

- Definition

Amount of separate account liability payable to policyholder upon surrender of contract before maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480109/944-80-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-18

+ Details

Name:	us-gaap_SeparateAccountLiabilityCashSurrenderValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) in separate account liability from performance of investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-18

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480109/944-80-50-2

+ Details

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

- Definition

Amount of decrease in separate account liability from policy charge.

+ References

+ Details

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

- Definition

Amount of cash inflow to separate account liability from premium and deposit from cash received.

+ References

+ Details

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

- 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:	us-gaap_SeparateAccountLiabilityRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of decrease in separate account liability from contract redemption and withdrawal of funds.

+ References

+ Details

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

- Definition

Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480141/944-80-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480109/944-80-50-2

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-18

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480109/944-80-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480141/944-80-45-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

Name:	us-gaap_SeparateAccountsLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=crbg_GroupRetirementSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=crbg_LifeInsuranceOperatingSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=crbg_InstitutionalMarketsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: