Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Consolidated Balance Sheets [Abstract]
Allowances for accounts receivable, current	$ 91	$ 105
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 issued (in shares)	106,025,000	106,025,000
Common stock, shares outstanding (in shares)	105,370,000	105,536,000