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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Accounts receivable, allowances $ 19 $ 19
Accumulated depreciation $ 551 $ 523
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) 140,637,000 138,345,000
Shares outstanding (in shares) 140,637,000 138,345,000
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) 377,103,000 377,650,000
Shares outstanding (in shares) 377,103,000 377,650,000