Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Amortized cost, net	$ 41,376	$ 40,034
Equity securities, at fair value, cost	6,016	2,740
Other short term Investments, amortized cost	$ 4,009	$ 6,807
Preferred stock, par or stated value per share (in USD 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, liquidation preference	$ 2,025	$ 2,025
Common stock, par or stated value per share (in USD 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)	281,000,000	304,000,000
Treasury stock, shares (in shares)	619,000,000	596,000,000