Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) $ in Millions	Mar. 31, 2020 USD ($) shares	Mar. 31, 2020 € / shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 € / shares
Statement Of Financial Position [Abstract]
Trade and other receivables, allowances for doubtful accounts and sales returns | $	$ 34		$ 28
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	356,487,712		356,158,879
Common stock, shares outstanding	356,475,591		356,149,883