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Subsequent Event (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024		Jun. 30, 2023	Sep. 30, 2023
Subsequent Event [Line Items]
Repayments of Unsecured Debt			$ 22	[1]	$ 29
Current regulatory assets	$ 178		178			$ 178
Interest expense	267	$ 264	795		$ 794
Non-current regulatory assets	8,809		8,809			5,566
Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Current regulatory assets	122		122			136
Non-current regulatory assets	$ 59		$ 59			$ 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

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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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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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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