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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost $ 52,592,203 [1]
Amount at which shown in the balance sheet 56,877,573
Total Fixed Maturity Securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 48,238,946 [1]
Fair value 51,580,490
Amount at which shown in the balance sheet 51,580,490
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 161,492 [1]
Fair value 161,765
Amount at which shown in the balance sheet 161,765
United States Government Sponsored Agencies  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 601,672 [1]
Fair value 625,020
Amount at which shown in the balance sheet 625,020
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 4,147,343 [1]
Fair value 4,527,671
Amount at which shown in the balance sheet 4,527,671
Foreign Government Obligations  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 186,993 [1]
Fair value 205,096
Amount at which shown in the balance sheet 205,096
Corporate Securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 29,822,172 [1]
Fair value 32,536,839
Amount at which shown in the balance sheet 32,536,839
Residential Mortgage Backed Securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 1,477,738 [1]
Fair value 1,575,664
Amount at which shown in the balance sheet 1,575,664
Commercial Mortgage Backed Securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 5,591,167 [1]
Fair value 5,786,279
Amount at which shown in the balance sheet 5,786,279
Other Asset Backed Securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 6,250,369 [1]
Fair value 6,162,156
Amount at which shown in the balance sheet 6,162,156
Mortgage Loans on Real Estate  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 3,448,793 [1]
Fair value 3,536,446
Amount at which shown in the balance sheet 3,448,793
Derivative Instruments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 412,163 [1]
Fair value 1,355,989
Amount at which shown in the balance sheet 1,355,989
Other Investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized cost 492,301 [1]
Amount at which shown in the balance sheet $ 492,301
[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.