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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Statement of Financial Position [Abstract]    
Accounts and notes receivable, reserve for doubtful accounts $ 8us-gaap_AllowanceForNotesAndLoansReceivableCurrent $ 7us-gaap_AllowanceForNotesAndLoansReceivableCurrent
Preferred stock, authorized shares 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, Issued shares 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, Outstanding shares 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, authorized shares 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, issued shares 63,702,325us-gaap_CommonStockSharesIssued 64,634,731us-gaap_CommonStockSharesIssued
Common stock, outstanding shares 63,449,960us-gaap_CommonStockSharesOutstanding 64,382,366us-gaap_CommonStockSharesOutstanding
Common treasury stock, shares 252,365us-gaap_TreasuryStockShares 252,365us-gaap_TreasuryStockShares