Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Debt - Additional Information (Details) € in Billions	1 Months Ended		3 Months Ended	9 Months Ended
Debt - Additional Information (Details) € in Billions	Jun. 30, 2022 USD ($)	Jun. 30, 2022 EUR (€)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 EUR (€)	Sep. 30, 2021 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of senior notes				$ 3,218,000,000	$ 0
June 2022 Notes \| Designated as Hedging Instrument \| Net Investment Hedging
Debt Instrument [Line Items]
Portion hedged of 2022 Notes \| €						€ 1.2
Commercial Paper
Debt Instrument [Line Items]
Debt instrument term				397 days
Debt instrument, maximum borrowing capacity	$ 3,000,000,000		$ 3,000,000,000	$ 3,000,000,000
Commercial paper outstanding	$ 0		0	$ 0			$ 0
Commercial Paper March 2022
Debt Instrument [Line Items]
Repayments of commercial paper			300,000,000
Commercial Paper April 2022
Debt Instrument [Line Items]
Repayments of commercial paper			$ 650,000,000
Europe \| 1.50% Senior Notes due June 2026 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (percent)	1.50%		1.50%	1.50%		1.50%
Europe \| 2.00% Senior Notes due June 2029 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (percent)	2.00%		2.00%	2.00%		2.00%
Europe \| 2.375% Senior Notes due June 2034 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (percent)	2.375%		2.375%	2.375%		2.375%
Europe \| June 2022 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 3,200,000,000		$ 3,200,000,000	$ 3,200,000,000		€ 3.0
Proceeds from issuance of senior notes	$ 3,200,000,000	€ 3.0
Europe \| June 2022 Notes \| Senior Notes \| Minimum
Debt Instrument [Line Items]
Debt instrument term	4 years	4 years
Europe \| June 2022 Notes \| Senior Notes \| Maximum
Debt Instrument [Line Items]
Debt instrument term	12 years	12 years