Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Fixed maturities available-for-sale, amortized cost	$ 67,353	$ 68,087
Mortgage loans on real estate, valuation allowances	139	129
Reinsurance recoverable, allowance for credit loss	$ 0	$ 10
Common stock par value (in dollars per share)	$ 1.25	$ 1.25
Common stock authorized (in shares)	2,000,000	2,000,000
Common stock issued (in shares)	2,000,000	2,000,000
Common stock outstanding (in shares)	2,000,000	2,000,000