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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Accounts receivable, net of allowance $ 23 $ 17
Common Class A    
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock authorized (in shares) 1,000,000,000 1,000,000,000
Common stock, shares issued (in shares) 88,578,361 0
Common stock outstanding (in shares) 88,578,361 0
Common Class B    
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock authorized (in shares) 1,000,000,000 1,000,000,000
Common stock, shares issued (in shares) 421,450,000 505,830,022
Common stock outstanding (in shares) 421,450,000 505,830,022