Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) $ in Millions	Sep. 30, 2017 USD ($) shares	Sep. 30, 2017 € / shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 € / shares
Statement Of Financial Position [Abstract]
Trade and other receivables, allowances for doubtful accounts and sales returns | $	$ 24		$ 25
Common stock, par value | € / shares		€ 0.07		€ 0.07
Common stock, shares authorized	1,185,800,000		1,185,800,000
Common stock, shares issued	356,217,848		357,745,953
Common stock, shares outstanding	356,168,000		357,465,614