Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Derivative [Line Items]
Total assets	$ 28	$ 54
Total liabilities	3,412	3,138
Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total assets	28	30
Total liabilities	3,398	3,111
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total assets	0	24
Total liabilities	14	27
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total assets	26	30
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total assets	0	24
Other current assets | Commodity derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total assets	2	0
Other current assets | Commodity derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total assets	0	0
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total liabilities	50	24
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total liabilities	14	27
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total liabilities	2	10
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total liabilities	0	0
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities  Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total liabilities	3,346	3,077
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Total liabilities	$ 0	$ 0