Future Policy Benefits - Schedule of Balances and Changes in Present Value of Expected Net Premiums and Present Value of Expected Future Policy Benefits Underlying LFPB (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Present Value of Expected Net Premiums
Balance at then current discount rate, beginning of period, Present value of expected net premiums	$ 13,977,353	$ 13,053,386
Balance at original discount rate, beginning of period, Present value of expected net premium	14,012,553	13,521,221
Effect of changes in cash flow assumptions, Present value of expected net premiums		(5,364)
Effect of actual variances from expected experience, Present value of expected net premiums	(234,156)	(229,884)
Adjusted balance, beginning of period	13,778,397	13,285,973
Issuances, Present value of expected net premiums	1,003,321	1,836,290
Interest accrual at Original discount rate, Present value of expected net premiums	299,575	544,806
Net premiums collected, Present value of expected net premiums	(858,255)	(1,682,924)
Foreign currency translation, Present value of expected net premiums	(38,685)	28,408
Expected net premiums at original discount rate, end of period	14,184,353	14,012,553
Effect of changes in discount rate assumptions, Present value of expected net premiums	(444,845)	(35,200)
Balance at then current discount rate, end of period, Present value of expected net premiums	13,739,508	13,977,353
Present Value of Expected Future Policy Benefits
Balance at then current discount rate, beginning of period, Present value of expected future policy benefits	20,508,435	19,143,253
Balance at original discount rate, beginning of period, Present value of expected future policy benefits	20,391,694	19,706,818
Effect of changes in cash flow assumptions, Present value of expected future policy benefits		(7,254)
Effect of actual variances from expected experience, Present value of expected future policy benefits	(238,305)	(225,539)
Adjusted balance, beginning of period, Present value of expected future policy benefits	20,153,389	19,474,025
Issuances, Present value of expected future policy benefits	1,008,739	1,840,996
Interest accrual at Original discount rate, Present value of expected future policy benefits	458,419	856,727
Benefit payments, Present value of expected future policy benefits	(932,348)	(1,823,542)
Foreign currency translation, Present value of expected future policy benefits	(59,142)	43,488
Expected future policy benefits at original discount rate, end of period, Present value of expected future policy benefits	20,629,057	20,391,694
Effect of changes in discount rate assumptions, Present value of expected future policy benefits	(651,747)	116,741
Expected future policy benefits at then current discount rate, end of period, Present value of expected future policy benefits	19,977,310	20,508,435
LFPB	6,436,332	6,742,025
Less: reinsurance recoverables	2,819,445	3,001,074
Net LFPB, after reinsurance recoverables	$ 3,418,357	$ 3,530,008
Weighted-average duration of net LFPB	7 years 10 months 24 days	7 years 10 months 24 days
Term Life
Present Value of Expected Future Policy Benefits
LFPB	$ 6,237,802	$ 6,531,082