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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022		Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	$ 37,813,550		$ 44,866,019
Fixed maturity securities, available for sale, gross unrealized gains	77,897		225,792
Fixed maturity securities, available for sale, gross unrealized losses	(5,802,897)		(5,283,847)
Fixed maturity securities, available for sale, allowance for credit losses	(3,618)	$ (4,146)	(3,347)		$ (4,920)	$ (6,187)	$ (2,846)
Fair Value	32,084,932		39,804,617	[1]
Accrued interest receivable	370,600		425,400
U.S. Government and agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	172,650		173,638
Fixed maturity securities, available for sale, gross unrealized gains	7		70
Fixed maturity securities, available for sale, gross unrealized losses	(9,772)		(4,637)
Fixed maturity securities, available for sale, allowance for credit losses	0		0
Fair Value	162,885		169,071
States, municipalities and territories
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	3,198,091		4,356,251
Fixed maturity securities, available for sale, gross unrealized gains	5,049		41,565
Fixed maturity securities, available for sale, gross unrealized losses	(638,470)		(574,834)
Fixed maturity securities, available for sale, allowance for credit losses	0	0	0		0	(1,834)	(2,776)
Fair Value	2,564,670		3,822,982
Foreign corporate securities and foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	535,008		748,770
Fixed maturity securities, available for sale, gross unrealized gains	37		11,661
Fixed maturity securities, available for sale, gross unrealized losses	(106,818)		(83,579)
Fixed maturity securities, available for sale, allowance for credit losses	0		0
Fair Value	428,227		676,852
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	23,271,192		27,706,440
Fixed maturity securities, available for sale, gross unrealized gains	45,571		146,065
Fixed maturity securities, available for sale, gross unrealized losses	(4,102,472)		(3,687,370)
Fixed maturity securities, available for sale, allowance for credit losses	(2,911)	(3,132)	(3,214)		(3,214)	(3,743)	0
Fair Value	19,211,380		24,161,921
Residential mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	1,501,200		1,492,242
Fixed maturity securities, available for sale, gross unrealized gains	5,030		11,870
Fixed maturity securities, available for sale, gross unrealized losses	(163,149)		(126,368)
Fixed maturity securities, available for sale, allowance for credit losses	(97)	(67)	(133)		(1,706)	(610)	(70)
Fair Value	1,342,984		1,377,611
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	3,520,832		4,098,755
Fixed maturity securities, available for sale, gross unrealized gains	443		493
Fixed maturity securities, available for sale, gross unrealized losses	(538,245)		(411,770)
Fixed maturity securities, available for sale, allowance for credit losses	0		0
Fair Value	2,983,030		3,687,478
Other asset backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	5,614,577		6,289,923
Fixed maturity securities, available for sale, gross unrealized gains	21,760		14,068
Fixed maturity securities, available for sale, gross unrealized losses	(243,971)		(395,289)
Fixed maturity securities, available for sale, allowance for credit losses	(610)	$ (947)	0		$ 0	$ 0	$ 0
Fair Value	$ 5,391,756		$ 5,908,702
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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