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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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 | $ 197,449 |
Available for sale, due after one year through five years, amortized cost | 4,958,029 |
Available for sale, due after five years through ten years, amortized cost | 10,556,868 |
Available for sale, due after ten years through twenty years, amortized cost | 9,214,395 |
Available for sale, due after twenty years, amortized cost | 8,553,637 |
Available for sale, securities with a single maturity date, amortized cost | 33,480,378 |
Available for sale, amortized cost | 43,116,759 | $ 39,953,955
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, due in one year or less, fair value | 201,079 |
Available for sale, due after one year through five years, fair value | 5,114,727 |
Available for sale, due after five years through ten years, fair value | 10,827,764 |
Available for sale, due after ten years through twenty years, fair value | 10,080,377 |
Available for sale, due after twenty years, fair value | 9,378,089 |
Available for sale, securities with a single maturity date, fair value | 35,602,036 |
Available for sale, fair value | 45,372,989 | 41,060,494
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, due in one year or less, amortized cost | 0 |
Held for investment, due after one year through five years, amortized cost | 0 |
Held for investment, due after five years through ten years, amortized cost | 0 |
Held for investment, due after ten years through twenty years, amortized cost | 0 |
Held for investment, due after twenty years, amortized cost | 77,041 |
Held for investment, securities with a single maturity date, amortized cost | 77,041 |
Held for investment, amortized cost | 77,041 | 76,825
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, due in one year or less, fair value | 0 |
Held for investment, due after one year through five years, fair value | 0 |
Held for investment, due after five years through ten years, fair value | 0 |
Held for investment, due after ten years through twenty years, fair value | 0 |
Held for investment, due after twenty years, fair value | 76,460 |
Held for investment, securities with a single maturity date, fair value | 76,460 |
Held for investment, fair value | 76,460 | $ 68,766
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 1,028,484 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 1,105,567 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, securities without a single maturity date, fair value | 0 |
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 5,531,922 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 5,544,850 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, securities without a single maturity date, fair value | 0 |
Other Asset Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 3,075,975 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 3,120,536 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, securities without a single maturity date, fair value | $ 0 |

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