Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
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)	5,240,619,000	5,653,529,000
Common stock, shares outstanding (in shares)	5,233,869,000	5,646,119,000
Treasury stock (in shares)	6,750,000	7,410,000