Derivative Instruments and Hedging Activities - Schedule of Fair Values of Derivative Instruments and Other Amounts (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Foreign currency exchange derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	$ 11	$ 8
Foreign currency exchange derivatives \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset	1
Foreign currency exchange derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	13	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	6	8
Derivative liability	1,148	1,176
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 \| Long-term debt
Derivatives, Fair Value [Line Items]
Derivative liability, noncurrent	1,132	1,161
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, current	6	8
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, noncurrent	0	0
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, current	13	11
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, noncurrent	3	4
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815
Derivatives, Fair Value [Line Items]
Derivative asset	6	1
Derivative liability	0	13
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 \| Long-term debt
Derivatives, Fair Value [Line Items]
Derivative liability, noncurrent	0	0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, current	5	0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, noncurrent	1	1
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, current	0	13
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 \| Foreign currency exchange derivatives \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, noncurrent	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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