CONSOLIDATED STATEMENT OF SHAREHOLDERS EQUITY (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Tax effect of gain (losses) on derivatives qualifying as hedges	$ 0	$ 1	$ 1	$ 1
Tax effect of pension liability and postretirement adjustment	$ 0	$ (1)	$ (1)	$ (3)
Cash dividends declared, per share	$ 0.79	$ 0.77	$ 2.33	$ 2.27