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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 519 $ 823
Cash flows from operating activities    
Net income (loss) 909 652
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) 1,160 1,447
Amortization of nuclear fuel cost 285 284
Non-cash retirement benefit expense 250 243
Amortization of Regulatory Asset (16) (67)
Changes in current assets and liabilities    
Accounts receivable, net (60) (376)
Inventories and other current assets, net 26 86
Accounts payable and accrued liabilities 98 (126)
Accrued interest (51) (20)
Pension contributions (231) (230)
Other, net 211 111
Net cash provided by operating activities 2,227 2,496
Cash flows from investing activities    
Construction expenditures (1,476) (1,221)
Nuclear fuel expenditures 243 251
Loans and other receivables    
Advances (7) (6)
Repayments 6 5
Other, net (22) (6)
Net cash used in investing activities (1,698) (1,467)
Long-term debt    
Redemptions and repurchases of power bonds (1,860) [1] (1,286)
Repayments of Other Long-term Debt 20 20
Redemptions of debt of variable interest entities 0 (23)
Short-term debt issues (redemptions), net 1,541 (145)
Payments on leases and leasebacks (207) (44)
Other, net 15 (3)
Net cash provided by (used in) financing activities (531) (528)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (2)  
Net change in cash and cash equivalents   501
Cash and cash equivalents at end of period 500  
Significant non-cash transactions    
Proceeds from Issuance of Debt 0 997
Payments of Financing Costs $ 0 $ (4)
[1] (1) All redemptions were at 100 percent of par.