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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities    
Net income (loss) $ (191) $ (267)
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) 857 945
Amortization of nuclear fuel cost 117 130
Non-cash retirement benefit expense 311 304
Prepayment credits applied to revenue (52) (53)
Fuel cost adjustment deferral 55 54
Fuel cost tax equivalents 3 16
Environmental cleanup costs - Kingston ash spill - non cash 36 36
Changes in current assets and liabilities    
Accounts receivable, net 312 472
Inventories and other, net (54) (421)
Accounts payable and accrued liabilities (171) (266)
Accrued interest 22 25
Environmental cleanup costs - Kingston ash spill, net (51) (58)
Other, net (46) (50)
Net cash provided by operating activities 1,148 867
Cash flows from investing activities    
Construction expenditures (996) (1,143)
Nuclear fuel expenditures (213) (225)
Loans and other receivables    
Advances (4) (2)
Repayments 5 5
Other, net 4 6
Net cash used in investing activities (1,204) (1,359)
Cash flows from financing activities    
Issues of power bonds 1,067 69
Issues of variable interest entities 0 1,000
Redemptions and repurchases of power bonds (1,387) (125)
Redemptions of variable interest entities (6) 0
Short-term debt issues (redemptions), net 537 (482)
Payments on leases and leasebacks (55) (52)
Financing costs, net (7) (10)
Change in restricted cash of variable interest entity 0 (30)
Payments to U.S. Treasury (13) (13)
Other, net (29) (1)
Net cash provided by financing activities 107 356
Net change in cash and cash equivalents 51 (136)
Cash and cash equivalents at beginning of period 868 507
Cash and cash equivalents at end of period $ 919 $ 371