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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2024
Jun. 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 $ 0 $ 0
Cash flows from operating activities    
Net income (loss) 615 91
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) 1,610 1,647
Amortization of nuclear fuel cost 282 268
Non-cash retirement benefit expense 104 186
Other regulatory amortization and deferrals (49)  
Amortization of Regulatory Asset   26
Changes in current assets and liabilities    
Accounts receivable, net 74 401
Inventories and other current assets, net (122) (190)
Accounts payable and accrued liabilities (56) (120)
Accrued interest (19) (24)
Pension contributions (229) (231)
Asset Retirement Obligation, Cash Paid to Settle (214) (246)
Other, net (57) (32)
Net cash provided by operating activities 1,939 1,776
Cash flows from investing activities    
Construction expenditures (2,381) (1,825)
Nuclear fuel expenditures (190) (267)
Payments to Acquire Assets, Investing Activities (3) 0
Acquisition of leasehold interests in combustion turbine assets 0 155
Loans and other receivables    
Advances (4) (7)
Repayments 5 6
Other, net 27 15
Net cash used in investing activities (2,546) (2,233)
Long-term debt    
Redemptions and repurchases of power bonds (22) [1] (29)
Short-term debt issues (redemptions), net 678 (450)
Finance Lease, Principal Payments 46 36
Other, net 14 6
Net cash provided by (used in) financing activities 607 457
Proceeds from Issuance of Debt 0 992
Repayments of Other Long-term Debt 17 22
Payments of Financing Costs 0 4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 521 $ 520
[1]
(1) All redemptions were at 100 percent of par.