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Commitments and Contingencies - Table (Details) $ in Millions		Sep. 30, 2023 USD ($) megawatts	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Obligations
Megawatts provided under transmission obligations | megawatts		2,792
Accrual for Environmental Loss Contingencies, Gross		$ 16	$ 17
Estimated future decommissioning cost	[1]	7,489	7,162	$ 7,002
Nuclear
Obligations
Estimated future decommissioning cost		$ 3,808	$ 3,643	$ 3,428
[1] (1) Includes $272 million and $275 million at September 30, 2023 and 2022, respectively, in Current liabilities.

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Undiscounted amount of the accrual for environmental loss contingencies.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
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-URI https://asc.fasb.org//1943274/2147481999/410-20-25-4

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