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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details)	12 Months Ended
	Sep. 30, 2022
Derivative
Two Largest Customer Percentage of Total Operating Revenue	17.00%
Moody's, A1 Rating
Derivative
Banking Counterparties Credit Rating	A2
Natural Gas Banking Counterparties Credit Rating	A1
Moody's, B1 Rating
Derivative
Natural Gas Banking Counterparties Credit Rating	B1

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- Definition

Banking Counterparties Credit Rating

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- Definition

Natural Gas Banking Counterparties Credit Rating

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- Definition

Two Largest Customer Percentage of Total Operating Revenue

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- Definition

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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