Business and Basis of Presentation (Cost Of Reinsurance) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance prior to transition	$ 14,280,792	$ 12,664,445	$ 11,660,527		$ 10,878,087
Unwinding amounts related to unrealized investment gains and losses and other activity		34,021	(223,185)		53,125
Amounts related to unrealized investment gains and losses after transition	14,054,600	12,458,184	11,419,340
Balance after transition	$ 226,192	$ 206,261	$ 241,187
Variable / Universal Life | Other liabilities
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance prior to transition				$ 437,315
Amounts related to unrealized investment gains and losses after transition				191,098
Balance after transition				628,413
Variable / Universal Life | As Originally Reported | Other liabilities
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance prior to transition					$ 602,294
Variable / Universal Life | Unwinding amounts related to unrealized investment gains and losses | Other liabilities
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Unwinding amounts related to unrealized investment gains and losses and other activity				(246,899)
Variable / Universal Life | Balance prior to transition, excluding amounts related to unrealized investment gains and losses | Other liabilities
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance prior to transition				355,395
Variable / Universal Life | Impact from updates to certain universal life contract liabilities | Other liabilities
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Unwinding amounts related to unrealized investment gains and losses and other activity				$ 81,920