Nonconsolidated Partially-Owned Affiliates - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Gross profit	$ 298	$ 237	$ 639	$ 500
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Net sales			4,822	5,457
Gross profit			534	608
Net income			326	264
Net income attributable to the entity			$ 324	$ 259