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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities    
Net income (loss) $ (290) $ (35)
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) 1,457 1,311
Nuclear refueling outage amortization cost 0 38
Amortization of nuclear fuel cost 195 158
Non-cash retirement benefit expense 456 349
Prepayment credits applied to revenue (79) (79)
Fuel cost adjustment deferral (12) 7
Fuel cost tax equivalents 28 75
Environmental cleanup costs - Kingston ash spill - non cash 55 57
Changes in current assets and liabilities    
Accounts receivable, net 103 100
Inventories and other, net (136) (92)
Margin cash collateral, net (318) (24)
Accounts payable and accrued liabilities (137) 19
Accrued interest (63) (73)
Environmental cleanup costs - Kingston ash spill, net (81) (74)
Preconstruction costs 0 (96)
Other, net 74 62
Net cash provided by operating activities 1,252 1,703
Cash flows from investing activities    
Construction expenditures (1,617) (1,678)
Nuclear fuel expenditures (264) (184)
Loans and other receivables    
Advances (2) (26)
Repayments 9 9
Other, net 7 (1)
Net cash used in investing activities (1,867) (1,880)
Cash flows from financing activities    
Issues of power bonds 135 1,582
Issues of variable interest entities 1,000 0
Redemptions and repurchases of power bonds (2,690) (1,020)
Short-term debt issues (redemptions), net 2,047 (27)
Proceeds from leasebacks 0 5
Payments on leases and leasebacks (75) (109)
Proceeds from call monetization 60 0
Financing costs, net (72) (19)
Change in restricted cash of variable interest entity (30) 0
Payments to U.S. Treasury (21) (20)
Other, net 1 (1)
Net cash provided by financing activities 355 391
Net change in cash and cash equivalents (260) 214
Cash and cash equivalents at beginning of period 507 328
Cash and cash equivalents at end of period $ 247 $ 542