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