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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities    
Net income (loss) $ 609 $ 147
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) 1,475 1,391
Amortization of nuclear fuel cost 206 205
Non-cash retirement benefit expense 249 429
Prepayment credits applied to revenue (75) (75)
Fuel cost adjustment deferral (6) (91)
Fuel cost tax equivalents (17) 1
Changes in current assets and liabilities    
Accounts receivable, net 118 15
Inventories and other, net (117) 33
Accounts payable and accrued liabilities (208) 22
Accrued interest (65) (66)
Regulatory assets costs (18) (49)
Pension contributions (144) (132)
Insurance recoveries 50 175
Other, net (41) (18)
Net cash provided by operating activities 2,016 1,987
Cash flows from investing activities    
Construction expenditures (2,064) (1,694)
Combined cycle plant acquisition (342) 0
Nuclear fuel expenditures (252) (272)
Purchases of investments (1) 0
Loans and other receivables    
Advances (11) (3)
Repayments 7 5
Other, net (27) 3
Net cash used in investing activities (2,690) (1,961)
Long-term debt    
Redemptions and repurchases of power bonds (1,180) (363)
Redemptions of variable interest entities (15) (15)
Short-term debt issues (redemptions), net 1,986 (674)
Payments on leases and leasebacks (77) (70)
Payments to U.S. Treasury (5) (10)
Other, net (35) 9
Net cash provided by (used in) financing activities 674 (1,123)
Net change in cash and cash equivalents 0 (1,097)
Cash and cash equivalents at beginning of period 500 1,602
Cash and cash equivalents at end of period 500 505
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures $ 414 $ 242