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Condensed Consolidated Statements of Financial Position (Unaudited) (Parentheticals) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accumulated depreciation $ (4,648)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ (4,611)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
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 195,111,898us-gaap_CommonStockSharesIssued 198,930,240us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 195,111,898us-gaap_CommonStockSharesOutstanding 198,930,240us-gaap_CommonStockSharesOutstanding