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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 36,773,458 | $ 35,900,332
Fair value | 38,477,672 | 36,487,216
NAIC, Class 1 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 23,648,794 | 23,363,259
Fair value | 25,264,168 | 24,207,801
NAIC, Class 2 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 11,955,752 | 11,709,730
Fair value | 12,223,107 | 11,589,325
NAIC, Class 3 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 1,023,746 | 758,531
Fair value | 894,557 | 643,293
NAIC, Class 4 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 128,238 | 60,480
Fair value | 86,816 | 44,312
NAIC, Class 5 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 2,100 | 0
Fair value | 1,537 | 0
NAIC, Class 6 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 14,828 | 8,332
Fair value | $ 7,487 | $ 2,485

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