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Adoption of ASU 2018-12 (Summary of Changes in Net Asset Position of Ceded MRBs) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Total ceded MRBs, net | $ (2,358) | $ (729) |  |
Accounting Standards Update 2018-12 [Member] |  |  |  |
Total ceded MRBs, net |  |  |  | $ 336
Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |  |
Total ceded MRBs, net |  |  |  | 215
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |  |  |
Total ceded MRBs, net |  |  |  | 121
Variable Annuities [Member] |  |  |  |
Total ceded MRBs, net | $ (2,296) | $ (662) | $ 2,398 |
Variable Annuities [Member] | Accounting Standards Update 2018-12 [Member] |  |  |  |
Total ceded MRBs, net |  |  |  | 336
Variable Annuities [Member] | Accounting Standards Update 2018-12 [Member] | As Previously Reported [Member] |  |  |  |
Total ceded MRBs, net |  |  |  | 215
Variable Annuities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 [Member] | Retained Earnings [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |  |  |
Total ceded MRBs, net |  |  |  | $ 121

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