Liability For Future Policy Benefits (Additional Insurance Reserves) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Additional Liability, Long-Duration Insurance [Line Items]
Weighted-average duration of the liability in years (at original discount rate)	22 years	22 years
Weighted-average interest rate (at original discount rate)	3.34%	3.39%
Variable/Universal Life
Additional Liability, Long-Duration Insurance [Line Items]
Balance after reinsurance recoverables, including amounts in AOCI, end of period	$ 250,015	$ 179,987
Variable/Universal Life | Other Businesses
Additional Liability, Long-Duration Insurance [Line Items]
Balance after reinsurance recoverables, including amounts in AOCI, end of period	7,610	0
Variable/Universal Life | Total
Additional Liability, Long-Duration Insurance [Line Items]
Balance, including amounts in AOCI, post-flooring	16,351,053	14,280,792
Flooring impact and amounts in AOCI	617,186	831,583
Balance, excluding amounts in AOCI, beginning of period, pre-flooring	16,968,239	15,112,375
Effect of actual variances from expected experience and other activity			$ 9,840	$ 191,104
Adjusted balance, beginning of period			$ 16,978,079	$ 15,303,479
Assessments collected	269,478	297,419
Interest accrual	142,506	128,241
Benefits paid	(86,194)	(68,233)
Balance, excluding amounts in AOCI, end of period, pre-flooring	17,303,869	15,660,906
Flooring impact and amounts in AOCI	(513,439)	(1,014,852)
Balance, including amounts in AOCI, end of period, post-flooring	16,790,430	14,646,054
Less: Reinsurance recoverables	16,548,025	14,466,067
Balance after reinsurance recoverables, including amounts in AOCI, end of period	$ 242,405	$ 179,987