Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) € in Billions, ¥ in Billions	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 JPY (¥)	Sep. 30, 2022 EUR (€)	Sep. 30, 2022 JPY (¥)
Foreign currency denominated debt
Derivative [Line Items]
Derivative, notional amount	€ 2.9	¥ 30	€ 2.9	¥ 30