Condensed Consolidated Statements of Financial Position (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Fixed income securities, at fair value, amortized cost	$ 44,027	$ 41,376
Equity securities, at fair value, cost	4,410	6,016
Short-term, at fair value, amortized cost	$ 4,384	$ 4,009
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	81,000	81,000
Preferred stock, shares outstanding (in shares)	81,000	81,000
Preferred stock, shares aggregate liquidation preference (in shares)	$ 2,025	$ 2,025
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	900,000,000	900,000,000
Common stock, shares outstanding (in shares)	271,000,000	281,000,000
Treasury stock, shares (in shares)	629,000,000	619,000,000