Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 3,259,219	$ 19,341,518
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(59,699)	(803,628)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	4,448,519	6,619,197
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(232,356)	(547,459)
Available for sale, continuous unrealized loss position, total, fair value	7,707,738	25,960,715
Available for sale, continuous unrealized loss position, total, unrealized losses	(292,055)	(1,351,087)
United States Government Full Faith and Credit
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	144,582	543
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(96)	(3)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	0	7,785
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	0	(319)
Available for sale, continuous unrealized loss position, total, fair value	144,582	8,328
Available for sale, continuous unrealized loss position, total, unrealized losses	(96)	(322)
United States Government Sponsored Agencies
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	168,732	30,089
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(1,229)	(949)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	201,444	953,421
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(3,556)	(82,085)
Available for sale, continuous unrealized loss position, total, fair value	370,176	983,510
Available for sale, continuous unrealized loss position, total, unrealized losses	(4,785)	(83,034)
United States Municipalities, States and Territories
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	285,481	340,103
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(8,173)	(6,816)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	3,081	162,997
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(77)	(8,842)
Available for sale, continuous unrealized loss position, total, fair value	288,562	503,100
Available for sale, continuous unrealized loss position, total, unrealized losses	(8,250)	(15,658)
Foreign Government Obligations
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value		98,511
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses		(1,748)
Available for sale, continuous unrealized loss position, 12 months or more, fair value		11,859
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses		(2,411)
Available for sale, continuous unrealized loss position, total, fair value		110,370
Available for sale, continuous unrealized loss position, total, unrealized losses		(4,159)
Residential Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	212,404	145,613
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(2,686)	(2,638)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	11,332	22,689
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(1,005)	(1,487)
Available for sale, continuous unrealized loss position, total, fair value	223,736	168,302
Available for sale, continuous unrealized loss position, total, unrealized losses	(3,691)	(4,125)
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	602,394	2,141,560
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(9,366)	(37,150)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	194,328	2,090,835
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(4,417)	(97,676)
Available for sale, continuous unrealized loss position, total, fair value	796,722	4,232,395
Available for sale, continuous unrealized loss position, total, unrealized losses	(13,783)	(134,826)
Other Asset Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	752,413	4,073,249
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(11,709)	(252,265)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	3,375,016	271,994
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(167,482)	(17,969)
Available for sale, continuous unrealized loss position, total, fair value	4,127,429	4,345,243
Available for sale, continuous unrealized loss position, total, unrealized losses	(179,191)	(270,234)
Finance, Insurance and Real Estate \| Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	267,521	2,501,640
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(4,785)	(87,220)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	121,993	884,870
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(4,744)	(77,507)
Available for sale, continuous unrealized loss position, total, fair value	389,514	3,386,510
Available for sale, continuous unrealized loss position, total, unrealized losses	(9,529)	(164,727)
Manufacturing, Construction and Mining \| Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	161,633	2,045,859
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(6,039)	(84,972)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	44,606	349,738
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(3,951)	(34,635)
Available for sale, continuous unrealized loss position, total, fair value	206,239	2,395,597
Available for sale, continuous unrealized loss position, total, unrealized losses	(9,990)	(119,607)
Utilities and Related Sectors \| Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	334,635	2,313,271
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(7,730)	(82,119)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	51,269	591,482
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(3,482)	(45,838)
Available for sale, continuous unrealized loss position, total, fair value	385,904	2,904,753
Available for sale, continuous unrealized loss position, total, unrealized losses	(11,212)	(127,957)
Wholesale/Retail Trade \| Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	54,289	1,032,603
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(1,751)	(51,228)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	129,364	198,805
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(9,411)	(26,326)
Available for sale, continuous unrealized loss position, total, fair value	183,653	1,231,408
Available for sale, continuous unrealized loss position, total, unrealized losses	(11,162)	(77,554)
Services, Media and Other \| Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, continuous unrealized loss position, less than 12 months, fair value	275,135	4,618,477
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(6,135)	(196,520)
Available for sale, continuous unrealized loss position, 12 months or more, fair value	316,086	1,072,722
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(34,231)	(152,364)
Available for sale, continuous unrealized loss position, total, fair value	591,221	5,691,199
Available for sale, continuous unrealized loss position, total, unrealized losses	$ (40,366)	$ (348,884)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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