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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | $ 48,238,946 | $ 46,131,190
Available for sale securities, gross unrealized gains | 3,633,599 | 1,143,624
Available for sale securities, gross unrealized losses | (292,055) | (1,351,087)
Available for sale securities, fair value | 51,580,490 | 45,923,727
United States Government Full Faith and Credit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 161,492 | 11,872
Available for sale securities, gross unrealized gains | 369 | 102
Available for sale securities, gross unrealized losses | (96) | (322)
Available for sale securities, fair value | 161,765 | 11,652
United States Government Sponsored Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 601,672 | 1,208,468
Available for sale securities, gross unrealized gains | 28,133 | 13,095
Available for sale securities, gross unrealized losses | (4,785) | (83,034)
Available for sale securities, fair value | 625,020 | 1,138,529
United States Municipalities, States and Territories |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 4,147,343 | 3,880,703
Available for sale securities, gross unrealized gains | 388,578 | 261,222
Available for sale securities, gross unrealized losses | (8,250) | (15,658)
Available for sale securities, fair value | 4,527,671 | 4,126,267
Foreign Government Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 186,993 | 226,860
Available for sale securities, gross unrealized gains | 18,103 | 7,573
Available for sale securities, gross unrealized losses | 0 | (4,159)
Available for sale securities, fair value | 205,096 | 230,274
Corporate Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 29,822,172 | 28,483,138
Available for sale securities, gross unrealized gains | 2,796,926 | 727,105
Available for sale securities, gross unrealized losses | (82,259) | (838,729)
Available for sale securities, fair value | 32,536,839 | 28,371,514
Residential Mortgage Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 1,477,738 | 1,134,623
Available for sale securities, gross unrealized gains | 101,617 | 71,661
Available for sale securities, gross unrealized losses | (3,691) | (4,125)
Available for sale securities, fair value | 1,575,664 | 1,202,159
Commercial Mortgage Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 5,591,167 | 5,492,271
Available for sale securities, gross unrealized gains | 208,895 | 21,558
Available for sale securities, gross unrealized losses | (13,783) | (134,826)
Available for sale securities, fair value | 5,786,279 | 5,379,003
Other Asset Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities, amortized cost | 6,250,369 | 5,693,255
Available for sale securities, gross unrealized gains | 90,978 | 41,308
Available for sale securities, gross unrealized losses | (179,191) | (270,234)
Available for sale securities, fair value | $ 6,162,156 | $ 5,464,329

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