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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
Statement of Financial Position [Abstract]    
Accumulated depreciation $ 4,611us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 4,337us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Long-term Debt, current portion $ 3us-gaap_LongTermDebtCurrent $ 2us-gaap_LongTermDebtCurrent
Preferred Stock, par value $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 800,000,000us-gaap_CommonStockSharesAuthorized 800,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 198,930,240us-gaap_CommonStockSharesIssued 217,599,230us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 198,930,240us-gaap_CommonStockSharesOutstanding 217,599,230us-gaap_CommonStockSharesOutstanding