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CONSOLIDATED STATEMENTS OF CASH FLOWS
$ in Millions
 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Regulatory asset amount expensed $ (23) $ (261) $ (2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 521 322 322
Cash flows from operating activities      
Net income (loss) 1,352 1,417 1,119
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) 1,848 1,993 2,554
Amortization of nuclear fuel cost 388 379 382
Non-cash retirement benefit expense 324 314 324
Prepayment credits applied to revenue 0 (10) (100)
Changes in current assets and liabilities      
Accounts receivable, net 259 (40) (68)
Inventories and other current assets, net (12) (87) 65
Accounts payable and accrued liabilities (38) (155) 143
Accrued interest 1 (8) (36)
Pension contributions (305) (307) (304)
Settlements of asset retirement obligations (114) (89) (106)
Other, net (44) 52 (37)
Net cash provided by operating activities 3,636 3,720 3,938
Cash flows from investing activities      
Construction expenditures (1,643) (1,700) (1,759)
Nuclear fuel expenditures (342) (474) (457)
Purchases of investments (49) (48) (49)
Loans and other receivables      
Advances (8) (10) (12)
Repayments 7 11 4
Other, net 20 (22) 4
Net cash used in investing activities (2,015) (2,243) (2,269)
Long-term debt      
Issues of power bonds 997 0 998
Redemptions and repurchases of power bonds (1,427) (1,035) (1,731)
Redemptions of notes payable (23) (46) (53)
Payments on debt of variable interest entities (39) (38) (36)
Short-term debt issues (redemptions), net (865) (294) (782)
Payments on leases and leasebacks (55) (43) (42)
Financing costs, net (4) 0 (3)
Other, net (6) (21) (9)
Net cash (used in) provided by financing activities (1,422) (1,477) (1,658)
Net change in cash and cash equivalents 199 0 $ 11
Cash and cash equivalents at beginning of the year 299    
Cash and cash equivalents at end of the year $ 500 $ 299