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Commitments and Contingencies - Table (Details) $ in Millions		12 Months Ended
		Sep. 30, 2024 USD ($) megawatts	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Obligations
Megawatts provided under transmission obligations | megawatts		4,750
Accrual for Environmental Loss Contingencies, Gross		$ 15	$ 16
Estimated future decommissioning cost	[1]	$ 10,806	7,489	$ 7,162
Remaining terms of the transmission obligations, high end of range		5 years
Nuclear
Obligations
Estimated future decommissioning cost		$ 3,814	$ 3,808	$ 3,643
[1] (1) Includes $283 million and $272 million at September 30, 2024 and 2023, 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
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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