Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Amortized cost of fixed maturities available-for-sale	$ 63,853	$ 68,087
Allowance for credit losses of fixed maturities available-for-sale	2	24
Allowance for credit losses of mortgage loans on real estate	209	129
Allowance for credit losses of amounts due from reinsurers	$ 7	$ 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