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Valuation and Qualifying Accounts - Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accounts Receivable - Allowance for Expected Credit Losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 110 $ 173 $ 173
Valuation allowances and reserves, additions, charge to cost and expense (2) (3) 20
Valuation allowances and reserves, deduction (38) (65) (21)
Currency translation (3) 1 1
Other (5) 4 0
Balance at end of period 62 110 173
Deferred Tax Assets - Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 5,853 5,518 5,068
Valuation allowances and reserves, additions, charge to cost and expense 326 505 624
Valuation allowances and reserves, deduction (8) 0 0
Allowance benefits (204) (170) (174)
Balance at end of period $ 5,967 $ 5,853 $ 5,518