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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	$ 43,133,761	[1]
Amount at which shown in the balance sheet	44,757,568
Fixed Maturity Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	40,030,780	[1]
Fair value	41,129,260
Amount at which shown in the balance sheet	41,137,319
Fixed Maturity Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	39,953,955	[1]
Fair value	41,060,494
Amount at which shown in the balance sheet	41,060,494
United States Government Full Faith and Credit [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	11,864	[1]
Fair value	11,805
Amount at which shown in the balance sheet	11,805
United States Government Sponsored Agencies [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	1,368,340	[1]
Fair value	1,344,787
Amount at which shown in the balance sheet	1,344,787
United States Municipalities, States and Territories [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	3,626,395	[1]
Fair value	3,926,950
Amount at which shown in the balance sheet	3,926,950
Foreign Government Obligations [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	224,588	[1]
Fair value	232,233
Amount at which shown in the balance sheet	232,233
Corporate Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	26,338,214	[1]
Fair value	27,118,526
Amount at which shown in the balance sheet	27,118,526
Corporate Securities [Member] | Held For Investment [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	76,825	[1]
Fair value	68,766
Amount at which shown in the balance sheet	76,825
Residential Mortgage Backed Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	1,166,944	[1]
Fair value	1,254,835
Amount at which shown in the balance sheet	1,254,835
Commercial Mortgage Backed Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	5,422,255	[1]
Fair value	5,365,235
Amount at which shown in the balance sheet	5,365,235
Other Asset Backed Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	1,795,355	[1]
Fair value	1,806,123
Amount at which shown in the balance sheet	1,806,123
Mortgage Loans on Real Estate [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	2,480,956	[1]
Fair value	2,522,035
Amount at which shown in the balance sheet	2,480,956
Derivative Instruments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	313,729	[1]
Fair value	830,519
Amount at which shown in the balance sheet	830,519
Other Investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	308,296	[1]
Amount at which shown in the balance sheet	$ 308,774
[1] On the basis of cost adjusted for other than temporary impairments, repayments and amortization of premiums and accrual of discounts for fixed maturity securities and short-term investments, original cost for derivative instruments and unpaid principal balance less allowance for credit losses for mortgage loans.

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- Definition

This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010

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- Definition

This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010

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- Definition

This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010

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