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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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)

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