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Note 7. Derivative Instruments and Hedging Activities Derivatives Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax $ (7) $ (7)
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (6) 16
Derivatives used in Net Investment Hedge, Increase (Decrease), Gross of Tax (17) 67
Cost of Sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1 (3)
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (2) (14)
Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (1) 31
Selling, General and Administrative Expenses [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ (3) $ (1)