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STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Millions
 9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities    
Net income (loss) $ (35) $ 779
Adjustments to reconcile net income (loss) to net cash provided by operating activities    
Depreciation and amortization 1,311 1,255
Nuclear refueling outage amortization cost 38 82
Amortization of nuclear fuel cost 158 177
Non-cash retirement benefit expense 349 268
Prepayment credits applied to revenue (79) (79)
Fuel cost adjustment deferral 7 (808)
Environmental cleanup costs - Kingston ash spill - non cash 57 47
Changes in current assets and liabilities    
Accounts receivable, net 100 (89)
Inventories and other, net (116) (137)
Accounts payable and accrued liabilities 94 80
Accrued interest (73) (78)
Environmental cleanup costs - Kingston ash spill, net (74) (292)
Preconstruction costs (96) 0
Other, net 62 5
Net cash provided by operating activities 1,703 1,210
Cash flows from investing activities    
Construction expenditures (1,678) (1,491)
Nuclear fuel expenditures (184) (282)
Purchases of investments, net 0 5
Advances (26) (23)
Repayments 9 14
Other, net (1) 4
Net cash used in investing activities (1,880) (1,773)
Cash flows from financing activities    
Issues 1,582 679
Redemptions and repurchases (1,020) (35)
Short-term debt issues (redemptions), net (27) (10)
Proceeds from sale/leaseback financing 5 9
Payments on leases and leaseback financing (109) (79)
Bond premium received 0 28
Financing costs, net (19) (4)
Payments to U.S. Treasury (20) (25)
Other (1) (3)
Net cash provided by financing activities 391 560
Net change in cash and cash equivalents 214 (3)
Cash and cash equivalents at beginning of period 328 201
Cash and cash equivalents at end of period $ 542 $ 198