Supplemental Financial Information - Summary of Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2021	Sep. 30, 2020
Current
Trade	$ 469	$ 409
Other	16	14
Notes receivable from franchisees	10	13
Receivables, gross	495	436
Allowance for credit losses	(5)	(3)
Receivables, net	490	433
Non-current
Notes receivable from franchisees	3	13
Other notes receivable	3	8
Notes Receivable, Gross, Noncurrent	6	21
Allowance for losses	(3)	(4)
Noncurrent notes receivable, net	$ 3	$ 17

Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable.

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The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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Amount, after allowance for credit loss, of accounts and financing receivables, classified as noncurrent. Includes, but is not limited to, notes and loan receivable.

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Amount, before allowance for credit loss, of financing receivable, classified as current.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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