Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, Authorized shares	500,000,000	500,000,000
Preferred stock, Issued shares	0	0
Preferred stock, Outstanding shares	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, Authorized shares	5,000,000,000	5,000,000,000
Common stock, Issued shares	492,000,000	488,000,000
Common stock, Outstanding shares	469,000,000	465,000,000