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Policyholder Liabilities - Changes in Policyholder Account Balances (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Roll Forward]
Policyholder account balance, beginning balance	$ 58,781,836
Policyholder account balance, ending balance	59,019,189	$ 58,781,836
Fixed Index Annuities
Policyholder Account Balance [Roll Forward]
Policyholder account balance, beginning balance	53,808,184	55,001,391
Issuances	926,058	2,986,223
Premiums received	35,046	170,493
Policy charges	(75,223)	(272,604)
Surrenders and withdrawals	(1,213,070)	(3,945,504)
Benefit payments	(203,524)	(727,847)
Interest credited	83,963	598,639
Other	(313)	(2,607)
Policyholder account balance, ending balance	$ 53,361,121	$ 53,808,184
Weighted-average crediting rate	0.63%	1.11%
Net amount at risk (a)	$ 11,120,564	$ 10,987,198
Cash surrender value	49,205,688	49,551,657
Fixed Rate Annuities
Policyholder Account Balance [Roll Forward]
Policyholder account balance, beginning balance	6,589,577	6,860,060
Issuances	407,249	159,570
Premiums received	526	4,811
Policy charges	(2,100)	(6,587)
Surrenders and withdrawals	(180,822)	(574,590)
Benefit payments	(3,290)	(11,328)
Interest credited	38,884	151,762
Other	(482)	5,879
Policyholder account balance, ending balance	$ 6,849,542	$ 6,589,577
Weighted-average crediting rate	2.32%	2.28%
Net amount at risk (a)	$ 262,643	$ 258,826
Cash surrender value	$ 6,456,292	$ 6,208,597

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