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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities    
Net income (loss) $ 1,220 $ 546
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) 1,285 1,332
Amortization of nuclear fuel cost 282 243
Non-cash retirement benefit expense 243 253
Prepayment credits applied to revenue (75) (75)
Fuel cost adjustment deferral (6) 76
Fuel cost tax equivalents (8) 1
Changes in current assets and liabilities    
Accounts receivable, net (11) 286
Inventories and other current assets, net 5 (93)
Accounts payable and accrued liabilities (80) (200)
Accrued interest (52) (34)
Regulatory assets costs (8) (27)
Pension contributions (229) (230)
Other, net (42) (99)
Net cash provided by operating activities 2,524 1,979
Cash flows from investing activities    
Construction expenditures (1,354) (1,672)
Nuclear fuel expenditures (181) (230)
Loans and other receivables    
Advances (12) (10)
Repayments 3 3
Other, net (2) 11
Net cash used in investing activities (1,546) (1,898)
Long-term debt    
Issues of power bonds 998 999
Redemptions and repurchases of power bonds (1,731) [1] (558)
Repayments of debt of variable interest entities (18) (17)
Redemptions of notes payable (52) (26)
Short-term debt issues (redemptions), net (133) (407)
Payments on leases and leasebacks (40) (61)
Financing costs, net 3 4
Other, net 0 (6)
Net cash provided by (used in) financing activities (979) (80)
Net change in cash and cash equivalents (1) 1
Cash and cash equivalents at beginning of period 300 300
Cash and cash equivalents at end of period 299 301
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures 315 340
Capital Lease Obligations Incurred $ 0 $ 10
[1] (1) The 2018 Series A bonds were issued at 99.8 percent of par.(2) All redemptions were at 100 percent of par.