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Subsequent Event (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025		Mar. 31, 2024	Sep. 30, 2024
Subsequent Event [Line Items]
Repayments of Unsecured Debt			$ 1	[1]	$ 1
Current regulatory assets	$ 241		241			$ 191
Interest expense	293	$ 266	573		$ 528
Non-current regulatory assets	9,414		9,414			9,408
Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Current regulatory assets	3		3			102
Non-current regulatory assets	$ 13		$ 13			$ 64
[1] (2) All redemptions were at 100 percent of par.

X

- Definition

Interest and debt related expenses associated with nonoperating financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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-Topic 230
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

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