Unaudited Interim Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Fixed Maturities, Available-for-sale, allowance for credit losses	$ 3,727	$ 4,769
Fixed Maturities, Available-for-sale, amortized cost	23,394,831	21,311,087
Fixed maturities, trading, amortized cost	2,912,639	2,682,022
Equity securities, at cost	196,988	148,179
Commercial mortgage and other loans, allowance for credit losses	21,410	20,263
Other invested assets, at fair value	$ 79,571	$ 116,110
Common Stock, Par or Stated Value 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