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Derivative Instruments and Hedging Activities - Location and Amount of Gains and Losses on Derivative Instruments and Related Hedge Items (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in income on derivative $ (48) $ 81
Foreign currency exchange derivatives | Cost of sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in income on derivative (5) 2
Foreign currency exchange derivatives | Net financing charges    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in income on derivative (43) 79
Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax (47) (17)
Amount of gain (loss) reclassified from AOCI into income (4) 3
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 (13) (21)
Cash Flow Hedging | Foreign currency exchange derivatives | Cost of sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) reclassified from AOCI into income (1) 9
Cash Flow Hedging | Commodity derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax 1 4
Cash Flow Hedging | Commodity derivatives | Cost of sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) reclassified from AOCI into income (3) (6)
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 $ (35) $ 0