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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for uncollectible accounts $ 6 $ 5
Common stock, par value $ 0.1 $ 0.1
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 524,000,000 522,500,000
Treasury stock, shares 19,200,000 18,800,000