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SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Allowance for doubtful accounts      
Valuation and Qualifying Account      
Balance at beginning of year $ 68 $ 71 $ 64
Charged (credited) to costs and expenses 37 61 69
Other (63) (64) (62)
Balance at end of year 42 68 71
Deferred tax assets valuation allowance      
Valuation and Qualifying Account      
Balance at beginning of year 130 141 141
Charged (credited) to costs and expenses 18 16 (38)
Other (77) (27) 38
Balance at end of year $ 71 $ 130 $ 141