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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Available for sale securities, amortized cost	$ 48,238,946	$ 46,131,190
Available for sale securities, fair value	51,580,490	45,923,727
NAIC, Class 1 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	27,781,525	26,588,352
Available for sale securities, fair value	30,122,657	26,921,843
NAIC, Class 2 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	19,278,355	17,901,161
Available for sale securities, fair value	20,316,911	17,528,072
NAIC, Class 3 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	1,001,087	1,396,650
Available for sale securities, fair value	977,191	1,269,242
NAIC, Class 4 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	114,497	173,987
Available for sale securities, fair value	112,534	137,991
NAIC, Class 5 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	57,952	23,836
Available for sale securities, fair value	45,205	19,453
NAIC, Class 6 Designation
Investment Holdings [Line Items]
Available for sale securities, amortized cost	5,530	47,204
Available for sale securities, fair value	$ 5,992	$ 47,126

X

- 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=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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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 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
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