Segment Reporting (Tables) - USD ($)
$ in Millions

12 Months Ended

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