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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 526 $ 529
Cash flows from operating activities    
Net income (loss) 11 184
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) 515 384
Amortization of nuclear fuel cost 88 96
Non-cash retirement benefit expense 82 84
Amortization of Regulatory Asset 32 6
Changes in current assets and liabilities    
Accounts receivable, net 181 161
Inventories and other current assets, net (101) 73
Accounts payable and accrued liabilities (140) (91)
Accrued interest (13) (3)
Pension contributions (76) (75)
Other, net (86) 78
Net cash provided by operating activities 493 595
Cash flows from investing activities    
Construction expenditures (612) (564)
Nuclear fuel expenditures (137) 79
Loans and other receivables    
Advances (3) (4)
Repayments 6 1
Other, net 12 2
Net cash used in investing activities (734) (644)
Long-term debt    
Redemptions and repurchases of power bonds (1) (1)
Short-term debt issues (redemptions), net 286 55
Finance Lease, Principal Payments 31 5
Other, net (5) 8
Net cash provided by (used in) financing activities 249 57
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 8  
Net change in cash and cash equivalents   $ 8
Cash and cash equivalents at end of period $ 507