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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net income (loss) $ 750 $ 313
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) 875 898
Amortization of nuclear fuel cost 189 172
Non-cash retirement benefit expense 162 168
Prepayment credits applied to revenue (50) (50)
Fuel cost adjustment deferral (39) 106
Fuel cost tax equivalents (6) 2
Changes in current assets and liabilities    
Accounts receivable, net 230 440
Inventories and other current assets, net 19 (83)
Accounts payable and accrued liabilities (123) (216)
Accrued interest 4 11
Regulatory assets costs (5) (14)
Pension contributions (154) (155)
Other, net (10) (76)
Net cash provided by operating activities 1,842 1,516
Cash flows from investing activities    
Construction expenditures (958) (1,119)
Nuclear fuel expenditures (177) (195)
Loans and other receivables    
Advances (10) (5)
Repayments 2 2
Other, net 2 15
Net cash used in investing activities (1,141) (1,302)
Long-term debt    
Issues of power bonds 998 999
Redemptions and repurchases of power bonds (700) [1] (528)
Repayments of debt of variable interest entities (18) (17)
Redemptions of notes payable (29) (26)
Short-term debt issues (redemptions), net (13) (595)
Payments on leases and leasebacks (39) (38)
Financing costs, net 3 4
Payments to U.S. Treasury (3) (3)
Other, net (1) (2)
Net cash provided by (used in) financing activities 192 (214)
Net change in cash and cash equivalents 893 0
Cash and cash equivalents at beginning of period 300 300
Cash and cash equivalents at end of period 1,193 300
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures 294 395
Capital Lease Obligations Incurred $ 0 $ 3
[1] All redemptions were at 100 percent of par.