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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 518 $ 521 $ 322
Cash flows from operating activities      
Net income (loss) 1,512 1,352 1,417
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) 1,555 1,848 1,993
Amortization of nuclear fuel cost 383 388 379
Non-cash retirement benefit expense 333 324 314
Recognition of Deferred Revenue 0 0 10
Regulatory asset amount expensed 72 21 261
Changes in current assets and liabilities      
Accounts receivable, net (18) (259) 40
Inventories and other current assets, net 42 12 87
Accounts payable and accrued liabilities 178 (38) (155)
Accrued interest (18) 1 (8)
Pension contributions (306) (305) (307)
Settlements of asset retirement obligations 242 (114) 89
Other, net (91) 46 (52)
Net cash provided by operating activities 3,256 3,636 3,720
Cash flows from investing activities      
Construction expenditures (1,963) (1,643) (1,700)
Nuclear fuel expenditures (354) (342) (474)
Purchases of investments (50) (49) (48)
Loans and other receivables      
Repayments 9 7 11
Other, net 27 20 (22)
Net cash used in investing activities (2,338) (2,015) (2,243)
Long-term debt      
Issues of power bonds 500 997 0
Redemptions and repurchases of power bonds (1,860) (1,427) (1,035)
Payments on debt of variable interest entities (41) (39) (38)
Redemptions of Notes Payable 0 23 46
Short-term debt issues (redemptions), net 723 (865) (294)
Finance Lease, Principal Payments 250 55 43
Financing costs, net (2) (4) 0
Other, net 9 (6) (21)
Net cash (used in) provided by financing activities (921) (1,422) (1,477)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect   199 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total (3)    
Advances on loans receivable $ (7) $ (8) $ (10)