CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS
Receivables, allowances for losses and discounts (in dollars)	$ 42	$ 41	$ 42
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000	250,000,000
Common stock, shares issued	183,370,740	181,865,751	181,804,174
Treasury stock, shares	18,426,348	17,901,925	17,274,300