Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Available for sale securities, amortized cost	$ 46,131,190	$ 43,116,759
Available for sale securities, fair value	45,923,727	45,372,989
Available for sale securities and held for investment, amortized cost		43,193,800
Available for sale securities and held for investment, fair value		45,449,449
NAIC, Class 1 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	26,588,352
Available for sale securities, fair value	26,921,843
Available for sale securities and held for investment, amortized cost		26,669,427
Available for sale securities and held for investment, fair value		28,274,379
NAIC, Class 2 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	17,901,161
Available for sale securities, fair value	17,528,072
Available for sale securities and held for investment, amortized cost		15,198,551
Available for sale securities and held for investment, fair value		15,869,219
NAIC, Class 3 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	1,396,650
Available for sale securities, fair value	1,269,242
Available for sale securities and held for investment, amortized cost		1,161,737
Available for sale securities and held for investment, fair value		1,157,420
NAIC, Class 4 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	173,987
Available for sale securities, fair value	137,991
Available for sale securities and held for investment, amortized cost		134,838
Available for sale securities and held for investment, fair value		117,542
NAIC, Class 5 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	23,836
Available for sale securities, fair value	19,453
Available for sale securities and held for investment, amortized cost		17,015
Available for sale securities and held for investment, fair value		20,927
NAIC, Class 6 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	47,204
Available for sale securities, fair value	$ 47,126
Available for sale securities and held for investment, amortized cost		12,232
Available for sale securities and held for investment, fair value		$ 9,962

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

No definition available.

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- Definition

Fair value of fixed maturity portfolio, available for sale and held for investment, combined totals.

+ References

No definition available.

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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