Policyholders' Liabilities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023		Mar. 31, 2022
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period	[1]	$ 41,912,536
Net transfers (to) from separate account		(35,164)		$ (173,653)
Unearned revenue reserve		3,234,755		2,562,252
Other		4,208,054		3,085,191
Policyholder Account Balance, Total		$ 43,799,121	[1]	$ 37,234,064
Weighted-average crediting rate		2.46%		2.23%
Net amount at risk		$ 308,975,503		$ 314,855,314
Cash surrender value(3)		32,580,369		29,096,777
Total
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period		35,168,397		30,227,959
Deposits		1,479,368		1,847,651
Interest credited		220,382		172,681
Policy charges		(457,719)		(445,960)
Surrenders and withdrawals		(329,758)		(253,899)
Benefit payments		(35,395)		(36,255)
Net transfers (to) from separate account		35,164		210,237
Change in market value and other adjustments		275,873		(135,793)
Balance, end of period		36,356,312		31,586,621
Reinsurance and other recoverable		13,154,378		13,319,108
Policyholders' account balance net of reinsurance and other recoverables		23,201,934		18,267,513
Policyholder Account Balance, Total
Variable Annuities
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period		16,432,032		11,465,411
Deposits		948,987		1,288,963
Interest credited		78,629		33,157
Policy charges		(5,729)		(477)
Surrenders and withdrawals		(113,424)		(55,826)
Benefit payments		(10,624)		(9,694)
Net transfers (to) from separate account		10,253		134,051
Change in market value and other adjustments		191,448		18,261
Balance, end of period		17,531,572		12,873,846
Reinsurance and other recoverable		319,707		336,619
Policyholders' account balance net of reinsurance and other recoverables		17,211,865		12,537,227
Policyholder Account Balance, Total		$ 3,172,877		$ 3,408,635
Weighted-average crediting rate		1.85%		1.09%
Net amount at risk		$ 0		$ 0
Cash surrender value(3)		15,338,366		12,035,925
Variable/Universal Life
Additional Liability, Long-Duration Insurance [Roll Forward]
Balance, beginning of period		18,736,365		18,762,548
Deposits		530,381		558,688
Interest credited		141,753		139,524
Policy charges		(451,990)		(445,483)
Surrenders and withdrawals		(216,334)		(198,073)
Benefit payments		(24,771)		(26,561)
Net transfers (to) from separate account		24,911		76,186
Change in market value and other adjustments		84,425		(154,054)
Balance, end of period		18,824,740		18,712,775
Reinsurance and other recoverable		12,834,671		12,982,489
Policyholders' account balance net of reinsurance and other recoverables		5,990,069		5,730,286
Policyholder Account Balance, Total		$ 16,575,928		$ 16,615,142
Weighted-average crediting rate		3.02%		2.98%
Net amount at risk		$ 308,975,503		$ 314,855,314
Cash surrender value(3)		$ 17,242,003		$ 17,060,852

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