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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 40,794,611 | $ 40,030,780
Fair value | 42,176,161 | 41,129,260
NAIC, Class 1 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 25,850,507 | 25,607,268
Fair value | 26,875,133 | 26,507,798
NAIC, Class 2 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 13,612,067 | 13,037,592
Fair value | 14,013,896 | 13,295,648
NAIC, Class 3 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 1,187,828 | 1,201,059
Fair value | 1,151,654 | 1,155,702
NAIC, Class 4 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 111,827 | 154,226
Fair value | 104,462 | 137,188
NAIC, Class 5 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 19,537 | 17,475
Fair value | 21,840 | 24,664
NAIC, Class 6 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 12,845 | 13,160
Fair value | $ 9,176 | $ 8,260

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