Nonconsolidated Partially-Owned Affiliates - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Gross profit	$ 150	$ (153)	$ 789	$ 347
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Net sales			6,795	7,319
Gross profit			717	829
Net income			418	387
Net income attributable to the entity			$ 413	$ 381