Derivative Instruments and Hedging Activities - Schedule of Fair Values of Derivative Instruments and Other Amounts (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Derivatives, Fair Value [Line Items]
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other noncurrent assets	Other noncurrent assets
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Other current assets	Other current assets
Foreign currency exchange derivatives
Derivatives, Fair Value [Line Items]
Derivative asset	$ 10	$ 8
Foreign currency exchange derivatives | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	17	24
Foreign currency exchange derivatives | Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	3	4
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815
Derivatives, Fair Value [Line Items]
Derivative asset	9	8
Derivative liability, noncurrent	860	1,161
Derivative liability	880	1,176
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives
Derivatives, Fair Value [Line Items]
Derivative asset, current	9	8
Derivative asset, noncurrent	0	0
Derivative liability, current	17	11
Derivative liability, noncurrent	3	4
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivatives, Fair Value [Line Items]
Derivative asset	1	1
Derivative liability, noncurrent	0	0
Derivative liability	0	13
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives
Derivatives, Fair Value [Line Items]
Derivative asset, current	1	0
Derivative asset, noncurrent	0	1
Derivative liability, current	0	13
Derivative liability, noncurrent	$ 0	$ 0