The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangibles - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) ReportableSegment	Jun. 30, 2017 USD ($)
Finite Lived Intangible Assets [Line Items]
Number of reportable segments \| ReportableSegment			3
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense recognized on intangible assets	$ 24	$ 20	$ 71	$ 58
Expected future amortization expense [Abstract]
2018 (includes nine months actual and three months estimated)	95		95
2019	91		91
2020	90		90
2021	89		89
2022	$ 88		$ 88
Minimum [Member] \| Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)			3 years
Minimum [Member] \| Intellectual Property [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)			5 years
Minimum [Member] \| Customer and supplier relationships [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)			3 years
Maximum [Member] \| Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)			25 years
Maximum [Member] \| Intellectual Property [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)			25 years
Maximum [Member] \| Customer and supplier relationships [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)			24 years