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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities    
Net income (loss) $ 102 $ (37)
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) 449 472
Amortization of nuclear fuel cost 85 63
Non-cash retirement benefit expense 84 82
Prepayment credits applied to revenue (25) (25)
Fuel cost adjustment deferral 57 37
Fuel cost tax equivalents 2 (7)
Changes in current assets and liabilities    
Accounts receivable, net 299 375
Inventories and other current assets, net (61) (104)
Accounts payable and accrued liabilities (209) (246)
Accrued interest (24) (22)
Regulatory assets costs (16) (11)
Pension contributions (75) 0
Other, net (51) (61)
Net cash provided by operating activities 617 516
Cash flows from investing activities    
Construction expenditures (625) (866)
Nuclear fuel expenditures (100) (101)
Loans and other receivables    
Advances (3) (2)
Repayments 1 1
Other, net 20 0
Net cash used in investing activities (707) (968)
Long-term debt    
Redemptions and repurchases of power bonds (527) (4)
Short-term debt issues (redemptions), net 619 470
Payments on leases and leasebacks (1) (2)
Payments to U.S. Treasury (1) (2)
Other, net 0 1
Net cash provided by (used in) financing activities 90 463
Net change in cash and cash equivalents 0 11
Cash and cash equivalents at beginning of period 300 300
Cash and cash equivalents at end of period 300 311
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures 336 372
Capital lease obligations incurred $ 0 $ 9