Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Amortized cost of fixed maturities available-for-sale	$ 10,050	$ 2,606
Allowance for credit losses of fixed maturities available-for-sale	0	0
Valuation allowances for credit losses of mortgage loans on real estate	2	0
Allowance for credit losses of reinsurance recoverable	$ 0	$ 0
Common stock par value (in dollars per share)	$ 1.00	$ 1.00
Common stock authorized (in shares)	2,500,000	2,500,000
Common stock issued (in shares)	2,500,000	2,500,000
Common stock outstanding (in shares)	2,500,000	2,500,000