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Adoption of ASU 2018-12 (Summary of Balances of LFPB Liability for Future Claims) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020
--- | --- | --- | ---
Reinsurance recoverables | $ 19,309 | $ 19,443 |
Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables | 3,038 |  | $ 19,388
Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  | $ 19,882 | 16,350
Accounting Standards Update 2018-12 [Member] | Single A Discount Rate Measurement in AOCI [Member] |  |  |
Reinsurance recoverables |  |  | 2,431
Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] |  |  |
Reinsurance recoverables | $ 607 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] |  |  |
Reinsurance recoverables |  |  | 607
Other Operations [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 790
Other Operations [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | 790
Traditional Life [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 906
Traditional Life [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | 755
Traditional Life [Member] | Accounting Standards Update 2018-12 [Member] | Single A Discount Rate Measurement in AOCI [Member] |  |  |
Reinsurance recoverables |  |  | 151
UL and Other [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 332
UL and Other [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | 335
UL and Other [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] |  |  |
Reinsurance recoverables |  |  | (3)
Group Protection [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 162
Group Protection [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | 148
Group Protection [Member] | Accounting Standards Update 2018-12 [Member] | Single A Discount Rate Measurement in AOCI [Member] |  |  |
Reinsurance recoverables |  |  | 14
Other Operations [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 17,196
Other Operations [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | 14,320
Other Operations [Member] | Accounting Standards Update 2018-12 [Member] | Single A Discount Rate Measurement in AOCI [Member] |  |  |
Reinsurance recoverables |  |  | 2,266
Other Operations [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] |  |  |
Reinsurance recoverables |  |  | 610
Payout Annuities [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 2
Payout Annuities [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | 2
Protective [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 13,200
Protective [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | 12,000
Swiss Re [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
Reinsurance recoverables |  |  | 2,600
Swiss Re [Member] | Other Operations [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
Reinsurance recoverables |  |  | $ 1,300

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