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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2021 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	$ 55,189,841	[1]
Amount at which shown in the balance sheet	60,376,504
Total Fixed Maturity Securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	46,999,183	[1]
Fair value	51,305,943
Amount at which shown in the balance sheet	51,305,943
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	37,109	[1]
Fair value	37,793
Amount at which shown in the balance sheet	37,793
United States Government Sponsored Agencies
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	1,008,920	[1]
Fair value	1,040,953
Amount at which shown in the balance sheet	1,040,953
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	3,495,563	[1]
Fair value	3,927,201
Amount at which shown in the balance sheet	3,927,201
Foreign Government Obligations
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	380,646	[1]
Fair value	402,545
Amount at which shown in the balance sheet	402,545
Corporate Securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	31,084,629	[1]
Fair value	34,660,234
Amount at which shown in the balance sheet	34,660,234
Residential Mortgage Backed Securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	1,056,778	[1]
Fair value	1,125,049
Amount at which shown in the balance sheet	1,125,049
Commercial Mortgage Backed Securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	4,708,878	[1]
Fair value	4,840,311
Amount at which shown in the balance sheet	4,840,311
Other Asset Backed Securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	5,226,660	[1]
Fair value	5,271,857
Amount at which shown in the balance sheet	5,271,857
Mortgage Loans on Real Estate
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	5,687,998	[1]
Fair value	5,867,227
Amount at which shown in the balance sheet	5,687,998
Real Estate Investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	335,767	[1]
Fair value	337,939
Amount at which shown in the balance sheet	337,939
Derivative Instruments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	402,877	[1]
Fair value	1,277,480
Amount at which shown in the balance sheet	1,277,480
Other Investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	1,764,016	[1]
Amount at which shown in the balance sheet	$ 1,767,144
[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
-Paragraph 7
-Subparagraph (SX 210.12-15(Column B))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column C))
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