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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 44,430,896 | $ 43,193,800
Fair value | 44,867,478 | 45,449,449
NAIC, Class 1 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 26,684,401 | 26,669,427
Fair value | 27,202,339 | 28,274,379
NAIC, Class 2 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 16,234,429 | 15,198,551
Fair value | 16,224,126 | 15,869,219
NAIC, Class 3 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 1,315,549 | 1,161,737
Fair value | 1,264,462 | 1,157,420
NAIC, Class 4 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 176,033 | 134,838
Fair value | 150,805 | 117,542
NAIC, Class 5 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 12,566 | 17,015
Fair value | 17,592 | 20,927
NAIC, Class 6 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 7,918 | 12,232
Fair value | $ 8,154 | $ 9,962

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