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Consolidated Statements of Financial Position (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Allowance for doubtful accounts $ 54us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 55us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Stockholders' Equity:    
Common stock, par value (in dollars per share) $ 0us-gaap_CommonStockParOrStatedValuePerShare $ 0us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 400,000,000us-gaap_CommonStockSharesAuthorized 400,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 176,991,231us-gaap_CommonStockSharesIssued 177,087,230us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 176,991,231us-gaap_CommonStockSharesOutstanding 177,087,230us-gaap_CommonStockSharesOutstanding