Market Risk Benefits - Rollforward of Balances for Variable Annuity Products (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Variable Annuities
Market Risk Benefit [Roll Forward]
Balance, beginning of period	$ 4,550,625	$ 8,884,362
Effect of cumulative changes in non-performance risk	1,727,910	287,605
Balance, beginning of period, before effect of changes in non-performance risk	6,278,535	9,171,967
Attributed fees collected	878,381	958,638
Claims paid	(62,128)	(36,684)
Interest accrual	235,979	71,646
Actual in force different from expected	52,753	77,474
Effect of changes in interest rates	(2,869,989)	(6,853,674)
Effect of changes in equity markets	(940,654)	3,966,792
Effect of assumption update	330,769	(160,596)
Issuances	21,271
Other adjustments	(17,436)
Effect of changes in current period counterparty non-performance risk	0	0
Balance, end of period, before effect of changes in non-performance risk	3,907,481	7,195,563
Effect of cumulative changes in non-performance risk	(1,230,621)	(2,073,958)
Balance, end of period	2,676,860	5,121,605
Less: Reinsured Market Risk Benefits
Market Risk Benefit [Roll Forward]
Balance, beginning of period	(422,261)	(906,484)
Effect of cumulative changes in non-performance risk	0	0
Balance, beginning of period, before effect of changes in non-performance risk	(422,261)	(906,484)
Interest accrual	(38,016)	(6,801)
Actual in force different from expected	(6,588)	(6,817)
Effect of changes in interest rates	484,168	715,370
Effect of changes in equity markets	90,742	(416,593)
Effect of assumption update	(54,067)	23,170
Issuances	8,206
Other adjustments	(638,198)
Effect of changes in current period counterparty non-performance risk	(75,594)	226,717
Balance, end of period, before effect of changes in non-performance risk	(824,916)	(482,887)
Effect of cumulative changes in non-performance risk	0	0
Balance, end of period	(824,916)	(482,887)
Less: Reinsured Market Risk Benefits | Ohio National
Market Risk Benefit [Roll Forward]
Other adjustments	638,000
Less: Reinsured Market Risk Benefits
Market Risk Benefit [Roll Forward]
Attributed fees collected	(179,211)	(113,016)
Claims paid	5,903	1,567
Total, Net of Reinsurance
Market Risk Benefit [Roll Forward]
Balance, beginning of period	4,128,364	7,977,878
Effect of cumulative changes in non-performance risk	1,727,910	287,605
Balance, beginning of period, before effect of changes in non-performance risk	5,856,274	8,265,483
Attributed fees collected	699,170	845,622
Claims paid	(56,225)	(35,117)
Interest accrual	197,963	64,845
Actual in force different from expected	46,165	70,657
Effect of changes in interest rates	(2,385,821)	(6,138,304)
Effect of changes in equity markets	(849,912)	3,550,199
Effect of assumption update	276,702	(137,426)
Issuances	29,477
Other adjustments	(655,634)
Effect of changes in current period counterparty non-performance risk	(75,594)	226,717
Balance, end of period, before effect of changes in non-performance risk	3,082,565	6,712,676
Effect of cumulative changes in non-performance risk	(1,230,621)	(2,073,958)
Balance, end of period	$ 1,851,944	$ 4,638,718