Debt and Other Financing Activities - U.S. Accounts Receivable Sales Program - Additional Information (Details) - U.S. Accounts Receivable Sales Program [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Disclosure Of Sales Program Of Receivable [Line Items]
Maximum limit of receivables can transfer			$ 125		$ 125
Gain (loss) on sale of receivables	$ (1)	$ (1)	(1)	$ (1)
Sales against the buyers limit			50		113
Amount transferred in receivables			140		167
Gross cash proceeds received for receivables transferred and derecognized			205
Cash proceeds collected			268
Payments for (proceeds from) new transfers of receivables			63
Maximum [Member]
Disclosure Of Sales Program Of Receivable [Line Items]
Recorded liabilities related to service obligations and limited guarantee	$ 1		$ 1		$ 1