Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal number of units used to calculate payment on derivative.

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Nominal energy measure used to calculate payments on a derivative instrument.

+ References

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Nominal volume used to calculate payments on a derivative instrument.

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Nominal or face amount used to calculate payment on derivative.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts (Details) € in Millions, kWh in Millions, gal in Millions, DTH in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($) DTH kWh gal	Sep. 30, 2022 USD ($) DTH kWh gal	Sep. 30, 2023 EUR (€) DTH	Sep. 30, 2022 EUR (€) DTH
Commodity contracts \| Propane
Derivative [Line Items]
Notional Amounts (in millions) \| gal	727	874
Commodity contracts \| Electricity
Derivative [Line Items]
Notional Amounts (in millions) \| kWh	1,260	2,446
Natural gas futures, forward, basis swap, options and pipeline contracts \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	338	363	338	363
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,270	$ 1,358	€ 300	€ 300
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	$ 425	$ 465	€ 256	€ 411
Regulated Utility Operations \| Commodity contracts \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	38	19	38	19