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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 20 $ 27
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares outstanding 146,723,561 146,382,923
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares outstanding 0 0