Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Consolidated Balance Sheets [Abstract]
Allowances for accounts receivable, current	$ 148	$ 130
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	175,000,000	175,000,000
Common stock, shares outstanding (in shares)	104,671,000	104,793,000
Common stock, shares issued (in shares)	106,025,000	106,025,000