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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | $ 49,871,428 | [1]
Amount at which shown in the balance sheet | 49,427,498 |
Total Fixed Maturity Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 46,131,190 | [1]
Fair value | 45,923,727 |
Amount at which shown in the balance sheet | 45,923,727 |
United States Government Full Faith and Credit |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 11,872 | [1]
Fair value | 11,652 |
Amount at which shown in the balance sheet | 11,652 |
United States Government Sponsored Agencies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,208,468 | [1]
Fair value | 1,138,529 |
Amount at which shown in the balance sheet | 1,138,529 |
United States Municipalities, States and Territories |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 3,880,703 | [1]
Fair value | 4,126,267 |
Amount at which shown in the balance sheet | 4,126,267 |
Foreign Government Obligations |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 226,860 | [1]
Fair value | 230,274 |
Amount at which shown in the balance sheet | 230,274 |
Corporate Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 28,483,138 | [1]
Fair value | 28,371,514 |
Amount at which shown in the balance sheet | 28,371,514 |
Residential Mortgage Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,134,623 | [1]
Fair value | 1,202,159 |
Amount at which shown in the balance sheet | 1,202,159 |
Commercial Mortgage Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 5,492,271 | [1]
Fair value | 5,379,003 |
Amount at which shown in the balance sheet | 5,379,003 |
Other Asset Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 5,693,255 | [1]
Fair value | 5,464,329 |
Amount at which shown in the balance sheet | 5,464,329 |
Mortgage Loans on Real Estate |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 2,943,091 | [1]
Fair value | 2,920,612 |
Amount at which shown in the balance sheet | 2,943,091 |
Derivative Instruments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 441,616 | [1]
Fair value | 205,149 |
Amount at which shown in the balance sheet | 205,149 |
Other Investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 355,531 | [1]
Amount at which shown in the balance sheet | $ 355,531 |
[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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