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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 521 $ 520 $ 518
Cash flows from operating activities      
Net income (loss) 500 1,108 1,512
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) 2,235 2,076 1,555
Amortization of nuclear fuel cost 371 347 383
Non-cash retirement benefit expense 241 328 333
Regulatory asset amount expensed 31 70 72
Changes in current assets and liabilities      
Accounts receivable, net 301 (412) (18)
Inventories and other current assets, net (83) (163) 42
Accounts payable and accrued liabilities (1) 282 178
Accrued interest (1) (7) (18)
Pension contributions (306) (308) (306)
Settlements of asset retirement obligations (327) (291) 242
Other, net (89) (82) (91)
Net cash provided by operating activities 2,872 2,948 3,256
Cash flows from investing activities      
Construction expenditures (2,526) (2,361) (1,963)
Nuclear fuel expenditures (273) (283) (354)
Acquisition of leasehold interests in combustion turbine assets (155) 0 0
Purchases of investments (51) (51) (50)
Loans and other receivables      
Repayments 8 15 9
Other, net 10 26 27
Net cash used in investing activities (2,994) (2,663) (2,338)
Long-term debt      
Issues of power bonds 992 484 500
Redemptions and repurchases of power bonds (29) (1,028) (1,860)
Payments on debt of variable interest entities (39) (43) (41)
Short-term debt issues (redemptions), net (740) 392 723
Finance Lease, Principal Payments 56 85 250
Financing costs, net (4) (3) (2)
Other, net (1) 0 9
Net cash (used in) provided by financing activities 123 (283) (921)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 1 2 (3)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total 1    
Advances on loans receivable $ (7) $ (9) $ (7)