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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts receivable, allowances $ 739us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 645us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Series preferred stock, par value $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare
Series preferred stock, issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued 4,242,374,240us-gaap_CommonStockSharesIssued 2,967,610,119us-gaap_CommonStockSharesIssued