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Derivative Instruments and Hedging Activities - Location and Amount of Gains and Losses on Derivative Instruments and Related Hedge Items (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge $ 50 $ 7 $ 64 $ (16)
Foreign Currency Exchange Derivatives | Cost of Sales        
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge (4) 1 (1) 4
Foreign Currency Exchange Derivatives | Discontinued Operations [Domain]        
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge 0 (5) 5 (16)
Foreign Currency Exchange Derivatives | Net Financing Charges        
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge 51 (14) 60 (21)
Foreign Currency Exchange Derivatives | Provision For Income Tax [Member]        
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge 1 5 (2) 5
Equity swap | Selling, General And Administrative        
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge 2 20 2 12
Net Investment Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (105) (36) (77) (62)
Cash Flow Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (2) (4) 9 (11)
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Amount of Gain (Loss) Reclassified from AOCI into Income 11 (10) 31 (23)
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 (3) (5) 3 (11)
Cash Flow Hedging | Foreign Currency Exchange Derivatives | Cost of Sales        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Amount of Gain (Loss) Reclassified from AOCI into Income 8 2 24 11
Cash Flow Hedging | Foreign Currency Exchange Derivatives | Discontinued Operations [Domain]        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Amount of Gain (Loss) Reclassified from AOCI into Income 0 (10) 0 (24)
Cash Flow Hedging | Commodity Derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 1 1 6 0
Cash Flow Hedging | Commodity Derivatives | Cost of Sales        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Amount of Gain (Loss) Reclassified from AOCI into Income 3 (2) 7 (11)
Cash Flow Hedging | Forward Treasury Locks [Member] | Net Financing Charges        
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]        
Amount of Gain (Loss) Reclassified from AOCI into Income 0 0 0 1
Fair Value Hedging        
Fair Value Hedge [Abstract]        
Gain (Loss) Recognized in Income, Fair Value Hedge 0 0 1 0
Fair Value Hedging | Interest Rate Swaps | Net Financing Charges        
Fair Value Hedge [Abstract]        
Gain (Loss) Recognized in Income, Fair Value Hedge 0 0 (1) (3)
Fair Value Hedging | Fixed Rate Debt Swapped to Floating | Net Financing Charges        
Fair Value Hedge [Abstract]        
Gain (Loss) Recognized in Income, Fair Value Hedge $ 0 $ 0 $ 2 $ 3