Consolidated Balance Sheets (Parenthetical) $ in Millions	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 € / shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2015 € / shares
Statement Of Financial Position [Abstract]
Trade and other receivables, allowances for doubtful accounts and sales returns | $	$ 25		$ 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	357,745,953		362,338,369
Common stock, shares outstanding	357,465,614		362,338,369