Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowances	$ 61	$ 67
Common stock, par value (in USD per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	858,418,615	851,675,119
Common stock, shares outstanding (in shares)	856,905,400	850,180,317
Treasury stock, at cost (in shares)	1,513,215	1,494,802