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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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 | $ 290,310 |
Available for sale, due after one year through five years, amortized cost | 5,831,134 |
Available for sale, due after five years through ten years, amortized cost | 10,199,288 |
Available for sale, due after ten years through twenty years, amortized cost | 10,519,078 |
Available for sale, due after twenty years, amortized cost | 8,079,862 |
Available for sale, securities with a single maturity date, amortized cost | 34,919,672 |
Available for sale securities, amortized cost | 48,238,946 | $ 46,131,190
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, due in one year or less, fair value | 294,212 |
Available for sale, due after one year through five years, fair value | 6,061,370 |
Available for sale, due after five years through ten years, fair value | 10,829,871 |
Available for sale, due after ten years through twenty years, fair value | 11,812,300 |
Available for sale, due after twenty years, fair value | 9,058,638 |
Available for sale, securities with a single maturity date, fair value | 38,056,391 |
Available for sale securities, fair value | 51,580,490 | 45,923,727
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 | 1,477,738 |
Available for sale securities, amortized cost | 1,477,738 | 1,134,623
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 1,575,664 |
Available for sale securities, fair value | 1,575,664 | 1,202,159
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 | 5,591,167 |
Available for sale securities, amortized cost | 5,591,167 | 5,492,271
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 5,786,279 |
Available for sale securities, fair value | 5,786,279 | 5,379,003
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 | 6,250,369 |
Available for sale securities, amortized cost | 6,250,369 | 5,693,255
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 6,162,156 |
Available for sale securities, fair value | $ 6,162,156 | $ 5,464,329

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