Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, share authorized	0	0
Preferred Stock, share issued	0	0
Preferred Stock, share outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	3,200,000,000	3,200,000,000
Common stock, shares issued	1,669,000,000	1,667,000,000
Common stock, shares outstanding	1,204,000,000	1,231,000,000
Treasury stock, shares	473,000,000	435,000,000
Shares held in trust, shares	1,000,000	1,000,000