Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed Maturities, Available-for-sale, allowance for credit losses	$ 2,008	$ 4,769
Fixed maturities, available-for-sale, amortized cost	27,538,066	21,311,087
Fixed maturities, trading, amortized cost	3,476,746	2,682,022
Equity securities, at cost	824,270	148,179
Commercial mortgage and other loans, allowance for credit losses	37,689	20,263	$ 5,951	$ 4,552
Other invested assets, at fair value	$ 85,025	$ 116,110
Common stock, par value (in dollars per share)	$ 10	$ 10
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	250,000	250,000
Common stock, shares outstanding	250,000	250,000