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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2024
Sep. 30, 2024
Sep. 30, 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     $ 24 $ 7      
Cash flows from operating activities              
Net income (loss) $ 408 $ 307 533 434 $ 434    
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)     1,130 1,062      
Amortization of nuclear fuel cost     139 190      
Non-cash retirement benefit expense     74 69      
Other regulatory amortization and deferrals     150        
Amortization of Regulatory Asset       (4)      
Changes in current assets and liabilities              
Accounts receivable, net     91 300      
Inventories and other current assets, net     (58) (59)      
Accounts payable and accrued liabilities     10 (221)      
Accrued interest     53 19      
Pension contributions     (154) (153)      
Asset Retirement Obligation, Cash Paid to Settle     (133) (146)      
Other, net     (74) (60)      
Net cash provided by operating activities     1,461 1,431      
Cash flows from investing activities              
Construction expenditures     (2,396) (1,625)      
Nuclear fuel expenditures     (172) (170)      
Payments to Acquire Assets, Investing Activities     4 3      
Loans and other receivables              
Advances     0 (4)      
Repayments     6 4      
Other, net     (16) 26      
Net cash used in investing activities     (2,582) (1,772)      
Long-term debt              
Redemptions and repurchases of power bonds     (1) [1] (1)      
Short-term debt issues (redemptions), net     (815) 386      
Finance Lease, Principal Payments     35 31      
Other, net     2 11      
Net cash provided by (used in) financing activities     1,145 348      
Proceeds from Issuance of Debt     800 0      
Repayments of Other Long-term Debt     18 17      
Payments of Financing Costs     19 0      
Proceeds from Issuance of Unsecured Debt     1,231 0      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 547 $ 528 $ 547 $ 528 $ 528 $ 523 $ 521
[1]
(2) All redemptions were at 100 percent of par.