Investments - Additional Information (Details) $ in Thousands	12 Months Ended
Dec. 31, 2024 USD ($) commercial_mortgage_loan issuer Issue loan extension_option	Dec. 31, 2023 USD ($) Issue commercial_mortgage_loan issuer	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Investment funds, unfunded commitments	$ 433,000
Fair value	$ 17,155,012	$ 17,870,206
Percentage of fixed maturities at fair value	100.00%	100.00%
Fixed maturity, portfolio issues \| Issue	2,552	2,473
Fixed portfolio, number of issuers \| issuer	1,014	980
Unrealized loss	$ (1,924,989)	$ (1,499,357)
Increase in gross unrealized losses	$ (426,000)
Securities sold with a provision for credit losses		(66,000)
Percentage of invested assets rated below investment grade	2.00%
Par value of investments rated below investment grade	$ 648,000
Amortized cost of investments rated below investment grade	529,000
Fair value of investments rated below investment grade	462,000
Securities, cash, and short-term investments, amortized cost	1,000,000	1,000,000
Securities, cash, and short-term investments, fair value	$ 955,000	983,000
Number of loans \| loan	35
Number of loans collaterally dependent \| loan	6
Carrying value	$ 403,732	282,871
Provision (reversal) for credit losses	3,972	1,883
Increase in allowance for credit losses	4,000
Allowance for credit losses	7,644	3,672	$ 1,789
Realized gains (losses)	$ (24,188)	$ (65,676)	$ (76,548)
Number of loans in non-accrual status	5	0
Mortgage loans	$ 396,088	$ 279,199
Other long-term investments under fair value option	1,235,759	835,878
Capital called from investment funds	239,000
Unfunded Loan Commitment
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	$ 22,000
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Financing receivable, number of delinquent loans \| commercial_mortgage_loan	1
Outstanding principal on nonaccrual loan	$ 53,000
Delinquent loans, outstanding interest	31
Corporates
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 13,861,261	$ 14,405,183
Percentage of fixed maturities at fair value	81.00%	81.00%
Company-owned life insurance
Debt Securities, Available-for-sale [Line Items]
Other long-term investments under fair value option	$ 202,734	$ 0
Senior Loans In Default And On Non Accrual Status
Debt Securities, Available-for-sale [Line Items]
Non-accrual status with an amortized cost	5,500
Debt securities allowance for credit loss	3,300
Collaterally Dependent Loans \| Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Carrying value	53,900
Provision (reversal) for credit losses	3,900
Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Investment funds, unfunded commitments	167,000	0
Investment in Limited Partnerships
Debt Securities, Available-for-sale [Line Items]
Investment funds, unfunded commitments	433,396
Capital called from investment funds	239,000	154,000
Real Estate Investment Trust \| Fixed maturities available for sale \| Corporates
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 405,000	$ 425,000
Percentage of fixed maturities at fair value	2.00%	2.00%

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