Consolidated Balance Sheet Paranthetical - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares issued	1,621,062,898	1,609,670,817
Common stock, shares outstanding	1,373,496,628	1,362,104,547
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury shares	247,566,270	247,566,270