Derivative and Non-derivative Financial Instruments - Schedule of Derivative Instruments at Gross Value (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Foreign exchange contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets and other assets
Derivative [Line Items]
Assets	$ 1,096	$ 270
Foreign exchange contracts | Designated as Hedging Instrument | Accrued liabilities
Derivative [Line Items]
Liabilities	49	13
Foreign exchange contracts | Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivative [Line Items]
Assets	35	2
Foreign exchange contracts | Not Designated as Hedging Instrument | Accrued liabilities
Derivative [Line Items]
Liabilities	47	6
Interest rate swap | Designated as Hedging Instrument | Other assets
Derivative [Line Items]
Assets	0	138
Interest rate swap | Designated as Hedging Instrument | Other liabilities
Derivative [Line Items]
Liabilities	322	0
Cross-currency swap | Designated as Hedging Instrument | Other liabilities
Derivative [Line Items]
Liabilities	$ 0	$ 90