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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | $ 47,423,579 | [1]
Amount at which shown in the balance sheet | 53,605,414 |
Total Fixed Maturity Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 42,304,736 | [1]
Fair value | 47,538,893 |
Amount at which shown in the balance sheet | 47,538,893 |
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 | 37,471 | [1]
Fair value | 39,771 |
Amount at which shown in the balance sheet | 39,771 |
United States Government Sponsored Agencies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 995,465 | [1]
Fair value | 1,039,551 |
Amount at which shown in the balance sheet | 1,039,551 |
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 | 3,236,767 | [1]
Fair value | 3,776,131 |
Amount at which shown in the balance sheet | 3,776,131 |
Foreign Government Obligations |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 177,062 | [1]
Fair value | 202,706 |
Amount at which shown in the balance sheet | 202,706 |
Corporate Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 26,745,196 | [1]
Fair value | 31,156,827 |
Amount at which shown in the balance sheet | 31,156,827 |
Residential Mortgage Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,399,956 | [1]
Fair value | 1,512,831 |
Amount at which shown in the balance sheet | 1,512,831 |
Commercial Mortgage Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 4,119,650 | [1]
Fair value | 4,261,227 |
Amount at which shown in the balance sheet | 4,261,227 |
Other Asset Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 5,593,169 | [1]
Fair value | 5,549,849 |
Amount at which shown in the balance sheet | 5,549,849 |
Mortgage Loans on Real Estate |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 4,165,489 | [1]
Fair value | 4,327,885 |
Amount at which shown in the balance sheet | 4,165,489 |
Derivative Instruments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 363,276 | [1]
Fair value | 1,310,954 |
Amount at which shown in the balance sheet | 1,310,954 |
Other Investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 590,078 | [1]
Amount at which shown in the balance sheet | $ 590,078 |
[1] | On the basis of cost adjusted for 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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