Adoption of ASU 2018-12 (Summary of Changes in Reinsurance Recoverables) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
Reinsurance recoverables	$ 21,172	$ 21,264
Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			$ 20,713
Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Reinsurance recoverables			3,163
Traditional Life [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			460
Annuities Segment [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			5
UL and Other [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			919
Group Protection Segment [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			162
Other Operations [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			17,821
All Other [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			1,346
Retained Earnings [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Reinsurance recoverables			607
Retained Earnings [Member] | UL and Other [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Reinsurance recoverables			(3)
Retained Earnings [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Reinsurance recoverables			610
As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables		$ 23,910	17,550
As Previously Reported [Member] | Traditional Life [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			372
As Previously Reported [Member] | Annuities Segment [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			5
As Previously Reported [Member] | UL and Other [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			922
As Previously Reported [Member] | Group Protection Segment [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			148
As Previously Reported [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			14,757
As Previously Reported [Member] | All Other [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			1,346
Single A Discount Rate Measurement in AOCI [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			2,556
Single A Discount Rate Measurement in AOCI [Member] | Traditional Life [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			88
Single A Discount Rate Measurement in AOCI [Member] | Group Protection Segment [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			14
Single A Discount Rate Measurement in AOCI [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			2,454
Protective [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			13,200
Protective [Member] | As Previously Reported [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			12,000
Swiss Re [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			3,200
Swiss Re [Member] | As Previously Reported [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member]
Reinsurance recoverables			$ 1,700