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Segment Reporting (Tables) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting [Abstract] |  |  |
Schedule of Segment Reporting Information, by Segment | As the segment measure used by the CODM is net income, no reconciliation is necessary.
For the years ended September 30 (in millions)
| 2025 |  | 2024(2) |  | 2023(2)
Base Revenue | $ | 9,415 |  |  | $ | 8,725 |  |  | $ | 7,863 |
Fuel Revenue | 4,068 |  |  | 3,398 |  |  | 4,025 |
Other Revenue | 189 |  | 191 |  |  | 166 |
Total Operating Revenue | 13,672 |  |  | 12,314 |  |  | 12,054 |
Fuel | 2,376 |  |  | 2,169 |  |  | 2,549 |
Purchased Power | 2,106 |  |  | 1,581 |  |  | 1,633 |
Operating and Maintenance | 3,717 |  |  | 3,641 |  |  | 3,372 |
Depreciation and Amortization | 2,271 |  |  | 2,138 |  |  | 2,213 |
Interest Expense | 1,196 |  |  | 1,066 |  |  | 1,056 |
Tax Equivalents | 633 |  |  | 557 |  |  | 593 |
Other Segment Items(1) | 13 |  |  | 27 |  |  | 138 |
Net Income | $ | 1,360 |  |  | $ | 1,135 |  |  | $ | 500 |
Notes (1) Other segment items include non-utility related miscellaneous income and expenses, pension and post-retirement benefit costs, and interest income. (2) Prior period amounts have been reclassified to conform to the current period presentation resulting from the retrospective adoption of ASU 2023-07, Segment Reporting. Expanded segment disclosures were not required in the comparative periods presented because the company operated, and continues to operate, as a single reportable segment for which detailed segment expense disclosures were not previously required. |  |
Regulated Operating Revenue | $ 13,486 | $ 12,128 | $ 11,899
Segment Reporting, Other Segment Item, Amount | 13 | 27 | 138
Corporate Segment |  |  |
Regulated Operating Revenue | 9,415 | 8,725 | 7,863
Corporate Segment and Other Operating Segment |  |  |
Regulated Operating Revenue | $ 4,068 | $ 3,398 | $ 4,025

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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