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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Statement of Financial Position [Abstract]    
Accumulated depreciation $ 847us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 828us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, No par value (in dollars per share) $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
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 (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, Shares authorized 1,100,000,000us-gaap_CommonStockSharesAuthorized 1,100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, Shares issued 589,695,081us-gaap_CommonStockSharesIssued 589,695,081us-gaap_CommonStockSharesIssued
Common stock, Shares outstanding 438,313,874us-gaap_CommonStockSharesOutstanding 438,740,478us-gaap_CommonStockSharesOutstanding
Treasury stock, Shares 151,381,207us-gaap_TreasuryStockShares 150,954,603us-gaap_TreasuryStockShares