Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) $ in Millions	Mar. 31, 2019 USD ($) shares	Mar. 31, 2019 € / shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2018 € / shares
Statement Of Financial Position [Abstract]
Trade and other receivables, allowances for doubtful accounts and sales returns | $	$ 27		$ 31
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	355,501,298		355,323,822
Common stock, shares outstanding	355,494,014		355,271,737