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Consolidated Balance Sheet (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Statement of Financial Position [Abstract]    
Receivables, allowance $ 53 $ 55
Investments and long-term receivables, allowance $ 3 $ 3
Common stock, shares issued 150,925,911 150,925,911
Treasury stock, shares 6,276,004 6,643,553