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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | $ 46,727,050 | $ 46,131,190
Fixed maturity securities, available for sale, fair value | 48,037,107 | 45,923,727
NAIC, Class 1 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 26,735,031 | 26,588,352
Fixed maturity securities, available for sale, fair value | 27,929,128 | 26,921,843
NAIC, Class 2 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 18,402,270 | 17,901,161
Fixed maturity securities, available for sale, fair value | 18,615,641 | 17,528,072
NAIC, Class 3 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 1,346,654 | 1,396,650
Fixed maturity securities, available for sale, fair value | 1,275,240 | 1,269,242
NAIC, Class 4 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 172,012 | 173,987
Fixed maturity securities, available for sale, fair value | 147,717 | 137,991
NAIC, Class 5 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 5,061 | 23,836
Fixed maturity securities, available for sale, fair value | 5,017 | 19,453
NAIC, Class 6 Designation |  |
Investment Holdings [Line Items] |  |
Fixed maturity securities, available for sale, amortized cost | 66,022 | 47,204
Fixed maturity securities, available for sale, fair value | $ 64,364 | $ 47,126

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