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Derivative Instruments and Hedging Activities - Location and Amount of Gains and Losses Gross of Tax on Derivative Instruments and Related Hedge Items (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivative $ 37 $ (118) $ 90
Foreign currency exchange derivatives | Cost of sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivative (5) (16) 10
Foreign currency exchange derivatives | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivative 43 (103) 85
Foreign currency exchange derivatives | Selling, general and administrative      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivative (1) 0 0
Interest rate swaps | Net financing charges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivative 0 1 0
Equity swap | Selling, general and administrative      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) recognized in income on derivative 0 0 (5)
Cash Flow Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax (17) 15 21
Amount of gain (loss) reclassified from AOCI into income 1 (12) 16
Cash Flow Hedging | Foreign currency exchange derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax (1) (13) 26
Amount of gain (loss) reclassified from AOCI into income 1 (4) 25
Cash Flow Hedging | Commodity derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax 5 1 (21)
Amount of gain (loss) reclassified from AOCI into income 0 (8) (7)
Cash Flow Hedging | Interest rate swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax (21) 27 16
Amount of gain (loss) reclassified from AOCI into income 0 0 (2)
Net Investment Hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income $ (173) $ (223) $ 470