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Adoption of ASU 2018-12 (Summary of Changes in Net Liability Position of MRBs) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020
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Accounting Standards Update 2018-12 [Member] |  |  |
MRBs, net | $ (4,300) |  | $ 5,334
Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
MRBs, net |  |  | 1,034
Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] |  |  |
MRBs, net | (7,956) |  |
Accounting Standards Update 2018-12 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
MRBs, net | 3,656 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] | Cumulative Effects to Retained Earnings [Member] |  |  |
MRBs, net |  |  | 7,956
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effects to Credit Risk to AOCI [Member] |  |  |
MRBs, net |  |  | (3,656)
Variable Annuities [Member] |  |  |
MRBs, net | 6,268 | $ 7,974 |
Variable Annuities [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
MRBs, net |  |  | 5,207
Variable Annuities [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
MRBs, net |  |  | 831
Variable Annuities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] | Cumulative Effects to Retained Earnings [Member] |  |  |
MRBs, net |  |  | 7,968
Variable Annuities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effects to Credit Risk to AOCI [Member] |  |  |
MRBs, net |  |  | (3,592)
Fixed Annuities [Member] |  |  |
MRBs, net | 192 | 171 |
Fixed Annuities [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
MRBs, net |  |  | 118
Fixed Annuities [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
MRBs, net |  |  | 192
Fixed Annuities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] | Cumulative Effects to Retained Earnings [Member] |  |  |
MRBs, net |  |  | (22)
Fixed Annuities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effects to Credit Risk to AOCI [Member] |  |  |
MRBs, net |  |  | (52)
Retirement Plan Services [Member] |  |  |
MRBs, net | $ 9 | $ 15 |
Retirement Plan Services [Member] | Accounting Standards Update 2018-12 [Member] |  |  |
MRBs, net |  |  | 9
Retirement Plan Services [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |
MRBs, net |  |  | 11
Retirement Plan Services [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] | Cumulative Effects to Retained Earnings [Member] |  |  |
MRBs, net |  |  | 10
Retirement Plan Services [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effects to Credit Risk to AOCI [Member] |  |  |
MRBs, net |  |  | $ (12)

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- Definition Amount of guaranteed benefit in excess of current account balance 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 50 -Paragraph 7B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124506351&loc=SL117782768-158439 + Details
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