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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 520 $ 526
Cash flows from operating activities    
Net income (loss) 101 11
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) 538 515
Amortization of nuclear fuel cost 88 88
Non-cash retirement benefit expense 63 82
Other regulatory amortization and deferrals (69) 32
Changes in current assets and liabilities    
Accounts receivable, net 256 181
Inventories and other current assets, net (216) 101
Accounts payable and accrued liabilities (86) (140)
Accrued interest (16) (13)
Pension contributions (75) (76)
Other, net (145) 86
Net cash provided by operating activities 439 493
Cash flows from investing activities    
Construction expenditures (605) (612)
Nuclear fuel expenditures (192) (137)
Acquisition of leasehold interests in combustion turbine assets (78) 0
Loans and other receivables    
Advances 0 (3)
Repayments 3 6
Other, net (4) 12
Net cash used in investing activities (876) (734)
Long-term debt    
Redemptions and repurchases of power bonds (1) (1)
Short-term debt issues (redemptions), net 446 286
Finance Lease, Principal Payments 10 31
Other, net 2 (5)
Net cash provided by (used in) financing activities 437 249
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 0 $ 8
Cash and cash equivalents at end of period $ 500