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

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