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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 19,762,544 | $ 3,999,294
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (519,847) | (47,884)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 5,517,763 | 4,815,325
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (459,540) | (221,017)
Available for sale securities, continuous unrealized loss position, total, fair value | 25,280,307 | 8,814,619
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (979,387) | (268,901)
United States Government Full Faith and Credit |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 3,178 | 1,565
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (98) | (10)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 5,989 | 6,731
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (547) | (137)
Available for sale securities, continuous unrealized loss position, total, fair value | 9,167 | 8,296
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (645) | (147)
United States Government Sponsored Agencies |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 43,310 | 44,794
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,770) | (180)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 927,678 | 958,965
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (92,825) | (31,550)
Available for sale securities, continuous unrealized loss position, total, fair value | 970,988 | 1,003,759
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (95,595) | (31,730)
United States Municipalities, States and Territories |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 684,699 | 44,736
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (21,142) | (128)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 123,625 | 128,499
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (10,480) | (3,468)
Available for sale securities, continuous unrealized loss position, total, fair value | 808,324 | 173,235
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (31,622) | (3,596)
Foreign Government Obligations |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 106,283 | 49,663
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (4,031) | (337)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 60,641 | 12,625
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (3,640) | (1,688)
Available for sale securities, continuous unrealized loss position, total, fair value | 166,924 | 62,288
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (7,671) | (2,025)
Corporate Securities | Finance, Insurance and Real Estate Sectors |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,825,957 | 456,244
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (83,452) | (5,135)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 783,568 | 600,655
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (75,867) | (28,043)
Available for sale securities, continuous unrealized loss position, total, fair value | 3,609,525 | 1,056,899
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (159,319) | (33,178)
Corporate Securities | Manufacturing, Construction and Mining |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,145,542 | 222,985
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (70,140) | (3,475)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 294,755 | 231,196
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (26,064) | (10,849)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,440,297 | 454,181
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (96,204) | (14,324)
Corporate Securities | Utilities and Related Sectors |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,569,490 | 395,183
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (87,914) | (4,099)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 383,587 | 249,416
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (34,057) | (8,901)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,953,077 | 644,599
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (121,971) | (13,000)
Corporate Securities | Wholesale/Retail Trade |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,026,417 | 152,941
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (36,525) | (1,249)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 143,605 | 178,635
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (18,263) | (11,371)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,170,022 | 331,576
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (54,788) | (12,620)
Corporate Securities | Services, Media and Other |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 4,472,035 | 729,124
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (135,921) | (19,000)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 950,004 | 891,654
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (105,289) | (53,565)
Available for sale securities, continuous unrealized loss position, total, fair value | 5,422,039 | 1,620,778
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (241,210) | (72,565)
Corporate Securities | Insurance |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
Held for investment securities, continuous unrealized loss position, less than 12 months, fair value | 0 | 0
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value | 71,113 | 76,460
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (6,100) | (581)
Held for investment securities, continuous unrealized loss position, total, fair value | 71,113 | 76,460
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (6,100) | (581)
Residential Mortgage Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 396,096 | 39,771
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (9,620) | (387)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 41,760 | 32,917
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (2,057) | (2,084)
Available for sale securities, continuous unrealized loss position, total, fair value | 437,856 | 72,688
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (11,677) | (2,471)
Commercial Mortgage Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,423,197 | 1,096,757
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (40,541) | (10,385)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,610,912 | 1,306,437
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (78,819) | (59,455)
Available for sale securities, continuous unrealized loss position, total, fair value | 4,034,109 | 2,403,194
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (119,360) | (69,840)
Other Asset Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 3,066,340 | 765,531
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (27,693) | (3,499)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 191,639 | 217,595
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (11,632) | (9,906)
Available for sale securities, continuous unrealized loss position, total, fair value | 3,257,979 | 983,126
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (39,325) | $ (13,405)

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