Investments - Additional Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($) issuer loan Issue	Dec. 31, 2022 USD ($) Issue issuer
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 17,206,885	$ 16,503,365
Fixed maturity, portfolio issues \| Issue	2,379	2,328
Fixed portfolio, number of issuers \| issuer	987	979
Investment funds, unfunded commitments	$ 472,000
Increase in allowance for credit losses	1,300
Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 17,206,885	$ 16,503,365
Percentage of fixed maturities at fair value	100.00%	100.00%
Corporates \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 14,167,139	$ 13,666,064
Percentage of fixed maturities at fair value	82.00%	83.00%
Banks \| Corporates \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 1,300,000	$ 1,300,000
Percentage of fixed maturities at fair value	8.00%	8.00%
Unfunded loan commitment
Debt Securities, Available-for-sale [Line Items]
Carrying value, net of valuation allowance	$ 28,000
Investment in Limited Partnerships
Debt Securities, Available-for-sale [Line Items]
Capital called from investment funds	21,000
Investment funds, unfunded commitments	$ 471,690
Commercial mortgage loan participations
Debt Securities, Available-for-sale [Line Items]
Number of loans \| loan	25
Carrying value, net of valuation allowance	$ 204,275	$ 181,305

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