Receivables, Loans, Notes Receivable, and Others (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Accounts and Financing Receivable, after Allowance for Credit Loss, Current and Noncurrent [Abstract]
Accounts Receivable, Sale	$ 244	$ 612	$ 0
Outstanding Receivables Sold under Factoring Agreements	195	195
Accounts receivable	5,922	5,922		$ 5,723
Less: Allowance for expected credit losses	(72)	(72)		(110)
Accounts receivable - net	5,850	5,850		$ 5,613
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss, Beginning Balance		110	173
Provision (benefit) for expected credit losses		(3)	0
Write-offs charged against the allowance for expected credit losses		(30)	(50)
Other		(5)	7
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 72	$ 72	$ 130