Liability For Future Policy Benefits (Additional Insurance Reserves) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Insurance [Abstract]
Balance, including amounts in AOCI, post-flooring	$ 12,664,445	$ 11,660,527
Flooring impact and amounts in AOCI	1,269,237	(896,930)
Balance, excluding amounts in AOCI, beginning of period, pre-flooring	13,933,682	10,763,597
Effect of assumption update			$ 22,910	$ 2,197,592
Effect of actual variances from expected experience and other activity			26,204	(157,782)
Adjusted balance, beginning of period			$ 13,982,796	$ 12,803,407
Assessments collected	513,593	446,443
Interest accrual	237,869	203,986
Benefits paid	(151,097)	(100,856)
Balance, excluding amounts in AOCI, end of period, pre-flooring	14,583,161	13,352,980
Flooring impact and amounts in AOCI	(1,094,298)	(859,387)
Balance after Transition	13,488,863	12,493,593
Amounts related to unrealized investment gains and losses after transition	13,268,534	12,282,253
Additional Liability, Long-Duration Insurance, after Reinsurance	220,329	211,340
Gross assessments	$ 785,370	$ 627,513
Weighted-average duration of the liability in years (at original discount rate)	22 years	23 years
Weighted-average interest rate (at original discount rate)	3.39%	3.72%