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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Sep. 30, 2020
Accounts receivable, allowances	$ 19	$ 23
Class A Common Stock
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	1,000,000,000	1,000,000,000
Shares issued (in shares)	116,921,554	88,578,361
Shares outstanding (in shares)	116,921,554	88,578,361
Class B Common Stock
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	1,000,000,000	1,000,000,000
Shares issued (in shares)	397,461,268	421,450,000
Shares outstanding (in shares)	397,461,268	421,450,000

X

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Amount of allowance for credit loss on accounts receivable, classified as current.

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