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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities    
Net income (loss) $ (37) $ 81
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) 472 463
Amortization of nuclear fuel cost 63 72
Non-cash retirement benefit expense 82 84
Prepayment credits applied to revenue (25) (25)
Fuel cost adjustment deferral 37 (6)
Fuel cost tax equivalents (7) (9)
Changes in current assets and liabilities    
Accounts receivable, net 375 311
Inventories and other, net (104) (120)
Accounts payable and accrued liabilities (246) (348)
Accrued interest (22) (42)
Regulatory assets costs (11) (12)
Insurance recoveries 7 50
Other, net (68) (26)
Net cash provided by operating activities 516 473
Cash flows from investing activities    
Construction expenditures (866) (751)
Nuclear fuel expenditures (101) (219)
Loans and other receivables    
Advances (2) (10)
Repayments 1 2
Other, net 0 (20)
Net cash used in investing activities (968) (998)
Long-term debt    
Redemptions and repurchases of power bonds (4) (4)
Short-term debt issues (redemptions), net 470 521
Payments on leases and leasebacks (2) (2)
Payments to U.S. Treasury (2) (1)
Other, net 1 10
Net cash provided by (used in) financing activities 463 524
Net change in cash and cash equivalents 11 (1)
Cash and cash equivalents at beginning of period 300 500
Cash and cash equivalents at end of period 311 499
Significant non-cash transactions    
Capital Expenditures Incurred but Not yet Paid $ 372 $ 237