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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation [Abstract] |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | $ (1) |  | $ 0
Cash flows from operating activities |  |  |
Net income (loss) | 745 |  | 615
Adjustments to reconcile net income (loss) to net cash provided by operating activities |  |  |
Depreciation and amortization (including amortization of debt issuance costs and premiums/discounts) | 1,707 |  | 1,610
Amortization of nuclear fuel cost | 208 |  | 282
Non-cash retirement benefit expense | 112 |  | 104
Reg Asset Amortization | 38 |  |
Amortization of Regulatory Asset |  |  | (49)
Changes in current assets and liabilities |  |  |
Accounts receivable, net | (76) |  | 74
Inventories and other current assets, net | (67) |  | (122)
Accounts payable and accrued liabilities | 3 |  | (56)
Accrued interest | 31 |  | (19)
Pension contributions | (235) |  | (229)
Asset Retirement Obligation, Cash Paid to Settle | (190) |  | (214)
Other, net | (124) |  | (57)
Net cash provided by operating activities | 2,076 |  | 1,939
Cash flows from investing activities |  |  |
Construction expenditures | (3,442) |  | (2,381)
Nuclear fuel expenditures | (198) |  | (190)
Payments to Acquire Assets, Investing Activities | 4 |  | 3
Loans and other receivables |  |  |
Advances | 0 |  | (4)
Repayments | 10 |  | 5
Other, net | 6 |  | 27
Net cash used in investing activities | (3,628) |  | (2,546)
Long-term debt |  |  |
Redemptions and repurchases of power bonds | (1,022) | [1] | (22)
Short-term debt issues (redemptions), net | (847) |  | 678
Finance Lease, Principal Payments | 50 |  | 46
Other, net | (4) |  | 14
Net cash provided by (used in) financing activities | 1,551 |  | 607
Proceeds from Issuance of Debt | 800 |  | 0
Repayments of Other Long-term Debt | 23 |  | 17
Payments of Financing Costs | 25 |  | 0
Proceeds from Issuance of Unsecured Debt | 2,722 |  | 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 522 |  | $ 521
[1] | (3) All redemptions were at 100 percent of par.

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