Policyholder Liabilities (Changes in Policyholder Account Balances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	$ 58,781,836
Balance, end of year	60,901,641	$ 58,781,836
Fixed Rate Annuities
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	6,589,577	6,860,060
Issuances	840,022	159,570
Premiums received	12,472	4,811
Policy charges	(3,428)	(6,587)
Surrenders and withdrawals	(1,668,966)	(574,590)
Benefit payments	(13,085)	(11,328)
Interest credited	163,918	151,762
Other	(6,545)	5,879
Balance, end of year	$ 5,913,965	$ 6,589,577
Weighted-average crediting rate	2.66%	2.28%
Net amount at risk (a)	$ 266,438	$ 258,826
Cash surrender value	5,571,171	6,208,597
Fixed Index Annuities
Policyholder Account Balance [Roll Forward]
Balance, beginning of year	53,826,234	55,003,305
Issuances	7,555,709	3,001,738
Premiums received	152,532	170,493
Policy charges	(217,523)	(272,604)
Surrenders and withdrawals	(6,122,084)	(3,945,504)
Benefit payments	(836,507)	(727,847)
Interest credited	1,096,493	599,259
Other	(882)	(2,606)
Balance, end of year	$ 55,453,972	$ 53,826,234
Weighted-average crediting rate	2.03%	1.11%
Net amount at risk (a)	$ 11,721,734	$ 10,987,198
Cash surrender value	$ 50,983,033	$ 49,551,657