CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS
Trade receivables, reserves (in dollars)	$ 17	$ 17
Common stock, per share par value (in dollars per share)	$ 0.20
Common stock, authorized shares	1,100,000,000	1,100,000,000
Common stock, outstanding shares	891,360,091	890,557,537
Treasury stock, shares	127,681,335	119,951,199