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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2024
Mar. 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 $ 7 $ 1
Cash flows from operating activities    
Net income (loss) 434 149
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) 1,062 1,093
Amortization of nuclear fuel cost 190 176
Non-cash retirement benefit expense 69 124
Other regulatory amortization and deferrals (4)  
Amortization of Regulatory Asset   33
Changes in current assets and liabilities    
Accounts receivable, net 300 497
Inventories and other current assets, net (59) (235)
Accounts payable and accrued liabilities (221) (298)
Accrued interest 19 14
Pension contributions (153) (156)
Other, net (206) (243)
Net cash provided by operating activities 1,431 1,154
Cash flows from investing activities    
Construction expenditures (1,625) (1,199)
Nuclear fuel expenditures (170) (229)
Payments to Acquire Assets, Investing Activities (3)  
Acquisition of leasehold interests in combustion turbine assets 0 78
Loans and other receivables    
Advances (4) 0
Repayments 4 4
Other, net 26 7
Net cash used in investing activities (1,772) (1,495)
Long-term debt    
Redemptions and repurchases of power bonds (1) [1] (1)
Short-term debt issues (redemptions), net 386 (600)
Finance Lease, Principal Payments 31 25
Other, net 11 2
Net cash provided by (used in) financing activities 348 342
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 $ 528 $ 521
[1]
(1) All redemptions were at 100 percent of par.