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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 41,984,675 | $ 40,030,780
Fair value | 43,970,487 | 41,129,260
NAIC, Class 1 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 26,718,443 | 25,607,268
Fair value | 28,144,706 | 26,507,798
NAIC, Class 2 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 13,907,192 | 13,037,592
Fair value | 14,499,548 | 13,295,648
NAIC, Class 3 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 1,229,695 | 1,201,059
Fair value | 1,207,581 | 1,155,702
NAIC, Class 4 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 97,349 | 154,226
Fair value | 89,144 | 137,188
NAIC, Class 5 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 19,559 | 17,475
Fair value | 20,698 | 24,664
NAIC, Class 6 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 12,437 | 13,160
Fair value | $ 8,810 | $ 8,260

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