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SEC Schedule, Article 12-09, Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Deferred Tax Assets - Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 1,655 $ 1,662 $ 1,637
Provision during period 90 (61) 94
Allowance adjustments 24 54 (69)
SEC Schedule, 12-09, valuation allowances and reserves, amount, ending balance 1,769 1,655 1,662
Accounts Receivable - Allowances      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 15 21 29
Provision during period 13 9 10
Allowance adjustments (5) (15) (16)
Currency translation 1 0 (2)
SEC Schedule, 12-09, valuation allowances and reserves, amount, ending balance $ 24 $ 15 $ 21