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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities    
Net income (loss) $ (245) $ (173)
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) 438 446
Amortization of nuclear fuel cost 51 67
Non-cash retirement benefit expense 152 152
Prepayment credits applied to revenue (26) (26)
Fuel cost adjustment deferral 53 86
Fuel cost tax equivalents 3 10
Environmental cleanup costs - Kingston ash spill - non cash 18 18
Changes in current assets and liabilities    
Accounts receivable, net 237 334
Inventories and other, net 18 (315)
Accounts payable and accrued liabilities (390) (258)
Accrued interest (8) (51)
Environmental cleanup costs - Kingston ash spill, net (25) (25)
Other, net (19) (8)
Net cash provided by operating activities 257 257
Cash flows from investing activities    
Construction expenditures (576) (661)
Nuclear fuel expenditures (74) (165)
Loans and other receivables    
Advances (4) 0
Repayments 2 4
Net cash used in investing activities (652) (822)
Cash flows from financing activities    
Issues of power bonds 975 0
Redemptions and repurchases of power bonds (11) (19)
Short-term debt issues (redemptions), net (507) 303
Payments on leases and leasebacks (6) (6)
Financing costs, net (5) 0
Payments to U.S. Treasury (6) (7)
Other, net (1) 0
Net cash provided by financing activities 439 271
Net change in cash and cash equivalents 44 (294)
Cash and cash equivalents at beginning of period 868 507
Cash and cash equivalents at end of period $ 912 $ 213