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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2020 USD ($)
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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Amount of investment held by insurance company, excluding investment in related party.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
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Cost of investment held by insurance company, excluding investment in related party.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column C))
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