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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)

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