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Derivative Instruments and Hedging Activities - Derivatives Gains and Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ (3)	$ (10)	$ (26)
Foreign currency exchange derivatives | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain (loss) on foreign currency exchange derivatives not designated as hedging instrument	(4)	(2)	4
Foreign currency exchange derivatives | Net financing charges
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain (loss) on foreign currency exchange derivatives not designated as hedging instrument	1	5	(5)
Foreign currency exchange derivatives | Cash flow hedging
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges on foreign currency exchange derivatives	(37)	(5)	(9)
Foreign currency exchange derivatives | Cash flow hedging | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges on foreign currency exchange derivatives, reclassified from AOCI	(16)	(4)	(3)
Equity swaps | Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain (loss) on equity swap derivatives not designated as hedging instrument	$ 0	$ (13)	$ (25)

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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