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Adoption of ASU 2018-12 (Summary of Changes in Net Liability Position of MRBs) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net liability in MRB	$ (729)	$ 2,511
Accounting Standards Update 2018-12 [Member]
Net liability in MRB			$ 5,334
Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Net liability in MRB			7,956
Retirement Plan Services Segment [Member] | Accounting Standards Update 2018-12 [Member]
Net liability in MRB			9
Retirement Plan Services Segment [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Net liability in MRB			10
As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
Net liability in MRB			1,034
As Previously Reported [Member] | Retirement Plan Services Segment [Member] | Accounting Standards Update 2018-12 [Member]
Net liability in MRB			11
Cumulative Effect of Credit Risk to AOCI [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Net liability in MRB			(3,656)
Cumulative Effect of Credit Risk to AOCI [Member] | Retirement Plan Services Segment [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Net liability in MRB			(12)
Variable Annuities [Member]
Net liability in MRB	(662)	2,398	5,207
Variable Annuities [Member] | Accounting Standards Update 2018-12 [Member]
Net liability in MRB			5,207
Variable Annuities [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Net liability in MRB			7,968
Variable Annuities [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
Net liability in MRB			831
Variable Annuities [Member] | Cumulative Effect of Credit Risk to AOCI [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Net liability in MRB			(3,592)
Fixed Annuity [Member]
Net liability in MRB	$ (45)	$ 114	118
Fixed Annuity [Member] | Accounting Standards Update 2018-12 [Member]
Net liability in MRB			118
Fixed Annuity [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Net liability in MRB			(22)
Fixed Annuity [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
Net liability in MRB			192
Fixed Annuity [Member] | Cumulative Effect of Credit Risk to AOCI [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Net liability in MRB			$ (52)

X

- Definition

Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (h)(1)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 55
-Paragraph 29G
-URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819547-158441

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 7B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124506351&loc=SL117782768-158439

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124509262&loc=SL117780254-158436

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