Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Condensed Consolidated Balance Sheets
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	100,000	100,000
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	3,200,000,000	3,200,000,000
Common Stock, shares issued (in shares)	1,717,000,000	1,712,000,000
Common Stock, shares outstanding (in shares)	1,019,000,000	1,014,000,000
Treasury Stock, shares (in shares)	697,000,000	697,000,000
Shares held in trust: 1 share at September 30, 2017 and December 31, 2016 (in shares)	1,000,000	1,000,000