Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Preferred stock, par value	$ 0	$ 0
Preferred stock, authorized	165,000,000	165,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	3,500,000,000	3,500,000,000
Common stock, issued	1,660,600,000	1,660,600,000
Common stock in treasury, shares	661,000,000	657,900,000