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Subsequent Event (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024		Mar. 31, 2023	Sep. 30, 2023
Subsequent Event [Line Items]
Repayments of Unsecured Debt			$ 1	[1]	$ 1
Current regulatory assets	$ 230		230			$ 178
Interest expense	266	$ 268	528		$ 530
Non-current regulatory assets	5,540		5,540			5,566
Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Current regulatory assets	191		191			136
Non-current regulatory assets	$ 80		$ 80			$ 52
[1] (1) All redemptions were at 100 percent of par.

X

- Definition

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

+ References

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-Section 50
-Paragraph 1
-SubTopic 20
-Topic 835
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- Definition

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.

+ References

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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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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.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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- Definition

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
-Publisher FASB
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