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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Accounts receivable, allowances $ 24 $ 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) 116,921,411 88,578,361
Shares outstanding (in shares) 116,921,411 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