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Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Increase (Decrease) In Accumulated Loss

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Debt Securities, Available-for-Sale, Securities Sold with a Provision for Credit Losses

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Entire Portfolio Number Of Issuers Of Fixed Maturities

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Total issues of fixed maturities.

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Fair Value Of Investment In Fixed Maturities Rated Below Investment Grade

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Par Value Of Investment In Fixed Maturities Rated Below Investment Grade

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Percentage of fixed maturities by component at fair value.

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Percentage Of Invested Assets Rated Below Investment Grade

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Securities, Cash And Short-Term Investments, Amortized Cost

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Securities, Cash And Short-Term Investments Held As Collateral, At Fair Value

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Investments - Additional Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023 USD ($) extension_option loan issuer Issue	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) issuer loan extension_option Issue	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) extension_option loan issuer Issue	Dec. 31, 2022 USD ($) issuer loan extension_option Issue	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 17,870,206				$ 16,503,365				$ 17,870,206	$ 16,503,365
Percentage of fixed maturities at fair value	100.00%				100.00%				100.00%	100.00%
Fixed maturity, portfolio issues \| Issue	2,473				2,328				2,473	2,328
Fixed portfolio, number of issuers \| issuer	980				979				980	979
Unrealized loss	$ (1,499,357)				$ (2,037,294)				$ (1,499,357)	$ (2,037,294)
Increase (decrease) in gross unrealized losses									538,000
Securities sold with a provision for credit losses									$ 66,000
Percentage of invested assets rated below investment grade	2.00%								2.00%
Par value of investments rated below investment grade	$ 646,000								$ 646,000
Amortized cost of investments rated below investment grade	530,000								530,000
Fair value of investments rated below investment grade	459,000								459,000
Securities, cash, and short-term investments, amortized cost	1,000,000				975,000				1,000,000	975,000
Securities, cash, and short-term investments, fair value	983,000				889,000				983,000	889,000
Capital called from investment funds									154,000
Investment funds, unfunded commitments	$ 744,000								$ 744,000
Number of loans \| loan	28								28
Increase in allowance for credit losses									$ 1,900
Allowance for credit losses	$ 3,672				1,789				3,672	1,789	$ 827
Realized gain (loss)—investments	$ 13,287	$ (2,193)	$ (45,843)	$ (30,927)	$ (9,703)	$ (29,155)	$ (30,446)	$ (7,244)	$ (65,676)	$ (76,548)	$ 59,319
Financing receivable, number of loans in delinquent \| loan	0				0				0	0
Number of loans in non-accrual status \| extension_option	0				0				0	0
Mortgage loans	$ 279,199				$ 181,305				$ 279,199	$ 181,305
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Realized gain (loss)—investments									(2,900)
Unfunded Loan Commitment
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	25,000								25,000
Corporates
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 14,405,183				$ 13,666,064				$ 14,405,183	$ 13,666,064
Percentage of fixed maturities at fair value	81.00%				83.00%				81.00%	83.00%
Investment in Limited Partnerships
Debt Securities, Available-for-sale [Line Items]
Capital called from investment funds									$ 154,000	$ 201,000
Investment funds, unfunded commitments	$ 744,368								744,368
Banks \| Fixed maturities available for sale \| Corporates
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 1,300,000				$ 1,300,000				$ 1,300,000	$ 1,300,000
Percentage of fixed maturities at fair value	7.00%				8.00%				7.00%	8.00%
Real Estate Investment Trust \| Fixed maturities available for sale \| Corporates
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 425,000				$ 428,000				$ 425,000	$ 428,000
Percentage of fixed maturities at fair value	2.00%				3.00%				2.00%	3.00%