Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) $ in Millions	Mar. 31, 2016 USD ($) shares	Mar. 31, 2016 € / shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2015 € / shares
Statement Of Financial Position [Abstract]
Trade and other receivables, allowances for doubtful accounts and sales returns | $	$ 27		$ 26
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	361,738,715		362,338,369
Common stock, shares outstanding	361,110,603		362,338,369