Consolidated Statement of Changes in Equity (Parenthetical) $ in Millions		12 Months Ended
	Sep. 13, 2021 $ / shares shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Sep. 01, 2020 shares
Par value less than $.5 million at each date | $		$ 0.5	$ 0.5	$ 0.5
Common stock held in treasury at cost (shares)		123,000,000	119,000,000
Common stock
Common stock activity, shares		500,000	500,000	500,000
Series Q Preferred Stock
Treasury stock, preferred (shares)					4,800
Depositary Shares
Common stock held in treasury at cost (shares)					19,200,000
Series T Preferred Stock
Common stock activity, shares	1,500,000
Depositary shares, conversion ratio	0.01
Preferred stock, dividend rate, percentage	3.40%
Preferred stock, par value (in dollars per share) | $ / shares	$ 1