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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2016 USD ($)
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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 + Details
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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 + Details
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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 + Details
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