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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($) Customers	Mar. 31, 2023	Sep. 30, 2023 USD ($)
Derivative
Accounts Receivable, before Allowance for Credit Loss, Current | $	$ 1,379	$ 1,379		$ 1,627
Two Largest Customer Percentage of Total Operating Revenue	1500.00%		1600.00%
Moody's, A1 Rating [Member]
Derivative
Natural Gas Banking Counterparties Credit Rating		A1
Moody's, B1 Rating [Member]
Derivative
Natural Gas Banking Counterparties Credit Rating		B1
Moody's, A2 Rating
Derivative
Banking Counterparties Credit Rating		A2
Credit of Customers
Derivative
Number of customers that represent the percent of sales		2
Number of customers that represent the percent of sales		2

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- Definition

Banking Counterparties Credit Rating

+ References

No definition available.

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- Definition

Number of customers that represent the percent of sales

+ References

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- Definition

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(1))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
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