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Nonconsolidated Partially-Owned Affiliates - Income Statement (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Gross profit	$ 592	$ 801	$ 904
Equity method investment, nonconsolidated investee or group of investees
Schedule of Equity Method Investments [Line Items]
Net sales	9,538	15,555	18,258
Gross profit	1,111	1,721	2,214
Net income	591	667	823
Net income attributable to the entity	$ 563	$ 629	$ 773

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