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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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Amortized cost of fixed maturity portfolio, available for sale and held for investment, combined totals.

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