Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	9,000,000,000	9,000,000,000
Common stock, shares issued (in shares)	4,604,441,000	4,746,047,000
Common stock, shares outstanding (in shares)	4,601,941,000	4,740,947,000
Treasury stock (in shares)	2,500,000	5,100,000