CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 5,970,459	$ 6,397,658
Cost	$ 16,006	$ 15,838
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	371,353,000	371,353,000
Common stock, shares outstanding (in shares)	299,478,000	320,336,000
Treasury stock, shares at cost (in shares)	71,875,000	51,017,000