CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Fixed maturity securities, available-for-sale securities, amortized cost	$ 43,903	$ 37,708
Fixed maturity securities, available-for-sale securities, allowance for credit losses	44	39
Available-for-sale securities, pledged securities, secured trust deposits	479	448
Allowance for credit loss	64	42
Short-term investments, pledged, secured trust deposits	0	6
Cash, pledged, secured trust deposits	396	242
Allowance for doubtful accounts, premiums and other receivables	31	33
Expected credit losses on reinsurance recoverable	$ 10	$ 10
Common stock, par or stated value per share (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares, outstanding (in shares)	272,158,235	272,309,890
Common stock, shares, issued (in shares)	327,721,410	327,757,349
Preferred stock, par or stated value per share (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury stock (in shares)	55,563,175	55,447,459