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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, due in one year or less, amortized cost | $ 365,686 |
Available for sale, due after one year through five years, amortized cost | 5,426,450 |
Available for sale, due after five years through ten years, amortized cost | 9,918,504 |
Available for sale, due after ten years through twenty years, amortized cost | 9,565,686 |
Available for sale, due after twenty years, amortized cost | 8,534,715 |
Available for sale, securities with a single maturity date, amortized cost | 33,811,041 |
Available for sale securities, amortized cost | 46,131,190 | $ 43,116,759
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, due in one year or less, fair value | 368,836 |
Available for sale, due after one year through five years, fair value | 5,416,871 |
Available for sale, due after five years through ten years, fair value | 9,768,751 |
Available for sale, due after ten years through twenty years, fair value | 9,895,985 |
Available for sale, due after twenty years, fair value | 8,427,793 |
Available for sale, securities with a single maturity date, fair value | 33,878,236 |
Available for sale securities, fair value | 45,923,727 | 45,372,989
Residential Mortgage Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 1,134,623 |
Available for sale securities, amortized cost | 1,134,623 | 1,028,484
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 1,202,159 |
Available for sale securities, fair value | 1,202,159 | 1,105,567
Commercial Mortgage Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 5,492,271 |
Available for sale securities, amortized cost | 5,492,271 | 5,531,922
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 5,379,003 |
Available for sale securities, fair value | 5,379,003 | 5,544,850
Other Asset Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 5,693,255 |
Available for sale securities, amortized cost | 5,693,255 | 3,075,975
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 5,464,329 |
Available for sale securities, fair value | $ 5,464,329 | $ 3,120,536

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