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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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 $ (3) $ 0
Cash flows from operating activities    
Net income (loss) 127 101
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) 527 538
Amortization of nuclear fuel cost 99 88
Non-cash retirement benefit expense 33 63
Amortization of Regulatory Asset (46) (69)
Changes in current assets and liabilities    
Accounts receivable, net 153 256
Inventories and other current assets, net (105) (216)
Accounts payable and accrued liabilities (289) (86)
Accrued interest (2) (16)
Pension contributions (75) (75)
Other, net (121) (145)
Net cash provided by operating activities 393 439
Cash flows from investing activities    
Construction expenditures (863) (605)
Nuclear fuel expenditures (146) (192)
Payments to Acquire Assets, Investing Activities (1) 0
Acquisition of leasehold interests in combustion turbine assets 0 78
Loans and other receivables    
Advances (4) 0
Repayments 2 3
Other, net 10 (4)
Net cash used in investing activities (1,002) (876)
Long-term debt    
Redemptions and repurchases of power bonds (1) [1] (1)
Short-term debt issues (redemptions), net 610 446
Finance Lease, Principal Payments 10 10
Other, net 7 2
Net cash provided by (used in) financing activities 606 437
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 518 $ 520
[1]
(1) All redemptions were at 100 percent of par.