Business and Basis of Presentation (Unearned Revenue Reserves) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance	$ 13,252,702	$ 12,664,445	$ 11,121,489	$ 11,660,527
Unwinding amounts related to unrealized investment gains and losses and other activity		$ (32,188)		$ (42,272)
Less: Reinsurance recoverables	13,029,847		10,902,945
Balance after transition, net of reinsurance recoverable	$ 222,855		$ 218,544
Variable/Universal Life | Policyholder Contract Deposit
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance					$ 1,745,268
Less: Reinsurance recoverables					751,517
Balance after transition, net of reinsurance recoverable					993,751
Variable/Universal Life | As Previously Reported | Policyholder Contract Deposit
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance						$ 1,377,669
Variable/Universal Life | Changes in benefit reserves | Policyholder Contract Deposit
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Unwinding amounts related to unrealized investment gains and losses and other activity					$ 367,599