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Derivative Instruments and Hedging Activities Location and Amount of Gains and Losses Gross of Tax on Derivative Instruments and Related Hedge Items (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative $ (11) $ (24) $ 18
Foreign currency exchange derivatives | Cost of sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative (18) (3) 1
Foreign currency exchange derivatives | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative (11) (12) 18
Foreign currency exchange derivatives | Income tax provision      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative 4 0 0
Equity swap | Selling, general and administrative      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative 14 (9) (1)
Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (15) (24) (6)
Amount of Gain (Loss) Reclassified from AOCI into Income (32) (9) 0
Cash Flow Hedging | Foreign currency exchange derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (18) (5) 1
Cash Flow Hedging | Foreign currency exchange derivatives | Cost of sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI into Income (21) 1 (2)
Cash Flow Hedging | Commodity derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 3 (19) (7)
Cash Flow Hedging | Commodity derivatives | Cost of sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI into Income (12) (11) 1
Cash Flow Hedging | Forward Treasury Locks | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI into Income 1 1 1
Fair Value Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative 0 0 0
Fair Value Hedging | Interest rate swaps | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative (5) 7 5
Fair Value Hedging | Fixed rate debt swapped to floating | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative $ 5 $ (7) $ (5)