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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect $ 30 $ (3)
Cash flows from operating activities    
Net income (loss) 125 127
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) 563 527
Amortization of nuclear fuel cost 75 99
Non-cash retirement benefit expense 36 33
Amortization of Regulatory Asset 22 46
Changes in current assets and liabilities    
Accounts receivable, net 116 153
Inventories and other current assets, net (68) (105)
Accounts payable and accrued liabilities (234) (201)
Accrued interest 12 (2)
Pension contributions (75) (75)
Asset Retirement Obligation, Cash Paid to Settle (73) (88)
Other, net (49) (121)
Net cash provided by operating activities 450 393
Cash flows from investing activities    
Construction expenditures (1,209) (863)
Nuclear fuel expenditures (159) (146)
Payments to Acquire Assets, Investing Activities 4 1
Loans and other receivables    
Advances 0 (4)
Repayments 1 2
Other, net (7) 10
Net cash used in investing activities (1,378) (1,002)
Long-term debt    
Redemptions and repurchases of power bonds (1) (1)
Short-term debt issues (redemptions), net 189 610
Finance Lease, Principal Payments 12 10
Other, net (6) 7
Net cash provided by (used in) financing activities 958 606
Proceeds from Issuance of Debt 800 0
Payments of Financing Costs 12 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 553 $ 518