Policyholders' Liabilities (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	[1]	$ 41,912,536
Transfer to (from) Policyholder Account Balance (to) from Separate Account		1,040,549	$ 284,135
Unearned revenue reserve		3,401,994	2,729,057
Other		4,841,412	3,081,856
Policyholder Account Balance, Total		$ 47,608,155	$ 39,204,409
Weighted-average crediting rate		2.20%	2.02%
Net amount at risk		$ 313,218,977	$ 295,739,871
Cash surrender value		35,732,427	28,941,512
Total
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period		35,168,397	30,227,959
Deposits		3,256,401	3,794,703
Interest credited		410,005	321,914
Policy charges		(913,912)	(897,226)
Surrenders and withdrawals		(633,664)	(547,284)
Benefit payments		(57,198)	(74,947)
Transfer to (from) Policyholder Account Balance (to) from Separate Account		1,040,549	284,135
Change in market value and other adjustments		1,094,171	284,242
Balance, end of period		39,364,749	33,393,496
Reinsurance and other recoverable		13,291,049	13,289,307
Policyholders' account balance net of reinsurance and other recoverables		26,073,700	20,104,189
Policyholder Account Balance, Total
Variable Annuities
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period		16,432,032	11,465,411
Deposits		2,225,558	2,709,044
Interest credited		131,119	31,825
Policy charges		(10,684)	(1,003)
Surrenders and withdrawals		(233,470)	(113,369)
Benefit payments		(15,067)	(20,563)
Transfer to (from) Policyholder Account Balance (to) from Separate Account		4,995	157,771
Change in market value and other adjustments		954,563	517,047
Balance, end of period		19,489,046	14,746,163
Reinsurance and other recoverable		418,986	334,311
Policyholders' account balance net of reinsurance and other recoverables		19,070,060	14,411,852
Policyholder Account Balance, Total		$ 3,081,376	$ 3,361,321
Weighted-average crediting rate		1.46%	0.49%
Net amount at risk		$ 0	$ 0
Cash surrender value		17,391,104	11,912,977
Variable/Universal Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period		18,736,365	18,762,548
Deposits		1,030,843	1,085,659
Interest credited		278,886	290,089
Policy charges		(903,228)	(896,223)
Surrenders and withdrawals		(400,194)	(433,915)
Benefit payments		(42,131)	(54,384)
Transfer to (from) Policyholder Account Balance (to) from Separate Account		1,035,554	126,364
Change in market value and other adjustments		139,608	(232,805)
Balance, end of period		19,875,703	18,647,333
Reinsurance and other recoverable		12,872,063	12,954,996
Policyholders' account balance net of reinsurance and other recoverables		7,003,640	5,692,337
Policyholder Account Balance, Total		$ 17,506,563	$ 16,577,232
Weighted-average crediting rate		2.89%	3.10%
Net amount at risk		$ 313,218,977	$ 295,739,871
Cash surrender value		18,341,323	17,028,535
Variable Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Transfer to (from) Policyholder Account Balance (to) from Separate Account		1,035,554	126,364
Fixed Annuities
Additional Liability, Long-Duration Insurance [Roll Forward]
Other		4,740,000	$ 2,983,000
Policy loans | Variable Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Transfer to (from) Policyholder Account Balance (to) from Separate Account		$ 900,000

[1] Prior period amounts adjusted for the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.