Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	$ 36,009,821	$ 38,537,462
Fixed maturity securities, available for sale, gross unrealized gains	168,432	237,889
Fixed maturity securities, available for sale, gross unrealized losses	(4,130,356)	(3,990,839)
Fixed maturity securities, available for sale, allowance for credit losses	(3,518)	(4,030)	$ (2,047)	$ (3,347)
Fair Value	$ 32,044,379	34,780,482
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued investment income (2024 and 2023 include $4,136 and $2,862 related to consolidated variable interest entities)
Accrued interest receivable	$ 352,800	360,900
U.S. Government and agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	28,354	172,683
Fixed maturity securities, available for sale, gross unrealized gains	13	606
Fixed maturity securities, available for sale, gross unrealized losses	(1,230)	(2,148)
Fixed maturity securities, available for sale, allowance for credit losses	0	0
Fair Value	27,137	171,141
States, municipalities and territories
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	3,392,780	3,654,571
Fixed maturity securities, available for sale, gross unrealized gains	9,188	17,477
Fixed maturity securities, available for sale, gross unrealized losses	(584,994)	(573,108)
Fixed maturity securities, available for sale, allowance for credit losses	0	0
Fair Value	2,816,974	3,098,940
Foreign corporate securities and foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	513,299	563,890
Fixed maturity securities, available for sale, gross unrealized gains	643	1,669
Fixed maturity securities, available for sale, gross unrealized losses	(80,934)	(71,820)
Fixed maturity securities, available for sale, allowance for credit losses	0	0
Fair Value	433,008	493,739
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	21,952,356	23,036,862
Fixed maturity securities, available for sale, gross unrealized gains	124,669	175,014
Fixed maturity securities, available for sale, gross unrealized losses	(2,808,944)	(2,605,048)
Fixed maturity securities, available for sale, allowance for credit losses	(3,293)	(3,412)	(1,914)	(3,214)
Fair Value	19,264,788	20,603,416
Residential mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	1,093,654	1,503,639
Fixed maturity securities, available for sale, gross unrealized gains	9,209	11,598
Fixed maturity securities, available for sale, gross unrealized losses	(107,733)	(112,736)
Fixed maturity securities, available for sale, allowance for credit losses	0	0	(133)	(133)
Fair Value	995,130	1,402,501
Commercial mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	3,121,755	3,405,647
Fixed maturity securities, available for sale, gross unrealized gains	2,701	995
Fixed maturity securities, available for sale, gross unrealized losses	(390,371)	(454,095)
Fixed maturity securities, available for sale, allowance for credit losses	0	0
Fair Value	2,734,085	2,952,547
Other asset backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, amortized cost	5,907,623	6,200,170
Fixed maturity securities, available for sale, gross unrealized gains	22,009	30,530
Fixed maturity securities, available for sale, gross unrealized losses	(156,150)	(171,884)
Fixed maturity securities, available for sale, allowance for credit losses	(225)	(618)	$ 0	$ 0
Fair Value	$ 5,773,257	$ 6,058,198

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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