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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities    
Net income (loss) $ 288 $ 102
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) 433 449
Amortization of nuclear fuel cost 94 85
Non-cash retirement benefit expense 82 84
Prepayment credits applied to revenue (25) (25)
Fuel cost adjustment deferral (12) 57
Fuel cost tax equivalents (5) 2
Changes in current assets and liabilities    
Accounts receivable, net 70 299
Inventories and other current assets, net 7 (61)
Accounts payable and accrued liabilities (179) (209)
Accrued interest (24) (24)
Regulatory assets costs (11) (16)
Pension contributions (75) (75)
Other, net (30) (51)
Net cash provided by operating activities 613 617
Cash flows from investing activities    
Construction expenditures (551) (625)
Nuclear fuel expenditures (71) (100)
Loans and other receivables    
Advances (6) (3)
Repayments 1 1
Other, net (1) 20
Net cash used in investing activities (628) (707)
Long-term debt    
Redemptions and repurchases of power bonds (698) [1] (527)
Redemptions of notes payable (2) 0
Short-term debt issues (redemptions), net 717 619
Payments on leases and leasebacks (1) (1)
Payments to U.S. Treasury (1) (1)
Net cash provided by (used in) financing activities 15 90
Net change in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 300 300
Cash and cash equivalents at end of period 300 300
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures $ 294 $ 336
[1] All redemptions were at 100 percent of par.