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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Receivables, allowances $ 86 $ 118
Common Stock, no par value      
Common Stock, shares issued 1,996,537,778 1,996,537,778
Treasury stock, shares 291,141,184 218,541,936