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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, 2018
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative $ 27 $ 42 $ (11)
Foreign currency exchange derivatives | Cost of sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative 5 (1) (20)
Foreign currency exchange derivatives | Discontinued Operations [Domain]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative 0 5 (30)
Foreign currency exchange derivatives | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative 33 44 21
Foreign currency exchange derivatives | Income tax provision      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative (3) (3) 4
Equity swap | Selling, general and administrative      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative (8) (3) 14
Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (12) 13 (15)
Amount of Gain (Loss) Reclassified from AOCI into Income 16 33 (32)
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 2 (1) (18)
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 4 25 9
Cash Flow Hedging | Foreign currency exchange derivatives | Discontinued Operations [Domain]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI into Income 0 0 (30)
Cash Flow Hedging | Commodity derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (14) 14 3
Cash Flow Hedging | Commodity derivatives | Cost of sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI into Income 12 8 (12)
Cash Flow Hedging | Forward Treasury Locks | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI into Income 0 0 1
Fair Value Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivative 0 1 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 0 (1) (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 $ 0 $ 2 $ 5