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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 523 $ 521 $ 520
Cash flows from operating activities      
Net income (loss) 1,135 500 1,108
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) 2,160 2,235 2,076
Amortization of nuclear fuel cost 364 371 347
Non-cash retirement benefit expense 138 241 328
Reg Asset Amortization (71)    
Regulatory asset amount expensed   31 70
Changes in current assets and liabilities      
Accounts receivable, net (16) 301 (412)
Inventories and other current assets, net (70) (83) (163)
Accounts payable and accrued liabilities 44 (1) 282
Accrued interest 8 (1) (7)
Pension contributions (304) (306) (308)
Asset Retirement Obligation, Cash Paid to Settle (283) (327) (291)
Other, net (102) (89) (82)
Net cash provided by operating activities 3,003 2,872 2,948
Cash flows from investing activities      
Construction expenditures (3,281) (2,526) (2,361)
Nuclear fuel expenditures (294) (273) (283)
Acquisition of leasehold interests in combustion turbine assets 0 155 0
Purchases of investments (52) (51) (51)
Payments to Acquire Loans Receivable 4 7 9
Loans and other receivables      
Repayments 6 8 15
Other, net 34 10 26
Net cash used in investing activities (3,591) (2,994) (2,663)
Long-term debt      
Issues of power bonds 991 992 484
Redemptions and repurchases of power bonds (1,022) (29) (1,028)
Payments on debt of variable interest entities (35) (39) (43)
Short-term debt issues (redemptions), net 734 (740) 392
Finance Lease, Principal Payments 76 56 85
Financing costs, net (5) (4) (3)
Other, net 3 (1) 0
Net cash (used in) provided by financing activities 590 123 (283)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect   $ 1 $ 2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total $ 2