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Acquisition of EMP - Additional Information (Details) € in Millions, $ in Millions			12 Months Ended
	Oct. 10, 2018 USD ($)	Oct. 10, 2018 EUR (€)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Revenues			$ 4,463	$ 4,475	$ 4,005
Operating income			(229)	$ 356	$ 217
EMP
Business Acquisition [Line Items]
Revenues			240
Operating income			$ 8
EMP
Business Acquisition [Line Items]
Purchase price of selected assets | €		€ 166
Agreed enterprise value for certain shares acquired	$ 180	155
Final purchase price	$ 190	€ 165

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