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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities      
Net income (loss) $ 469 $ 271 $ 60
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) 1,888 1,723 1,947
Amortization of nuclear fuel cost 279 268 264
Non-cash retirement benefit expense 572 622 607
Prepayment credits applied to revenue (100) (102) (105)
Fuel cost adjustment deferral (38) 97 (61)
Fuel cost tax equivalents 6 2 47
Environmental cleanup costs - Kingston ash spill - non cash 68 72 73
Changes in current assets and liabilities      
Accounts receivable, net (79) 114 89
Inventories and other current assets, net 34 27 (131)
Accounts payable and accrued liabilities 147 (296) 60
Accrued interest 2 1 (26)
Regulatory assets costs (56) (21) (14)
Pension contributions (256) (6) (8)
Environmental cleanup costs - Kingston ash spill, net (109) (99) (108)
Insurance recoveries 175 47 5
Other, net (22) (123) (125)
Net cash provided by operating activities 2,980 2,597 2,574
Cash flows from investing activities      
Construction expenditures (2,384) (2,051) (2,119)
Nuclear fuel expenditures (326) (287) (361)
Purchases of investments, net (48) (48) (48)
Loans and other receivables      
Advances (6) (6) (2)
Repayments 6 9 10
Other, net 2 (2) 7
Net cash used in investing activities (2,756) (2,385) (2,513)
Cash flows from financing activities      
Issues of power bonds 989 2,122 1,126
Issues of variable interest entities 0 360 1,000
Redemptions and repurchases of power bonds (365) (2,358) (2,717)
Payments on debt of variable interest entities (30) (13) (6)
Short-term debt issues (redemptions), net (1,837) 924 1,024
Payments on leases and leasebacks (73) (446) (84)
Proceeds from call monetization 0 0 60
Financing costs, net (4) (20) (75)
Payments to U.S. Treasury (14) (27) (27)
Other, net 8 (20) (1)
Net cash (used in) provided by financing activities (1,326) 522 300
Net change in cash and cash equivalents (1,102) 734 361
Cash and cash equivalents at beginning of the year 1,602 868 507
Cash and cash equivalents at end of the year $ 500 $ 1,602 $ 868