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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for uncollectible accounts $ 8 $ 7
Common stock, par value per share $ 0.1 $ 0.1
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 527,800,000 525,900,000
Treasury stock, shares 19,700,000 19,300,000