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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities      
Net income (loss) $ 271 $ 60 $ 162
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) 1,723 1,947 1,792
Amortization of nuclear fuel cost 268 264 225
Non-cash retirement benefit expense 622 607 465
Prepayment credits applied to revenue (102) (105) (105)
Fuel cost adjustment deferral 97 (61) 69
Fuel cost tax equivalents 2 47 135
Environmental cleanup costs - Kingston ash spill - non cash 72 73 76
Changes in current assets and liabilities      
Accounts receivable, net 114 89 (62)
Inventories and other, net 27 (131) (71)
Accounts payable and accrued liabilities (296) 60 60
Accrued interest 1 (26) (4)
Regulatory assets costs (21) (14) (21)
Pension contributions (6) (8) (274)
Environmental cleanup costs - Kingston ash spill, net (52) (103) (108)
Other, net (123) (125) 98
Net cash provided by operating activities 2,597 2,574 2,437
Cash flows from investing activities      
Construction expenditures (2,051) (2,119) (2,417)
Combustion turbine asset acquisition 0 0 (436)
Nuclear fuel expenditures (287) (361) (216)
Change in restricted cash and investments 0 0 (11)
Purchases of investments, net (48) (48) (56)
Loans and other receivables      
Advances (6) (2) (21)
Repayments 9 10 11
Other, net (2) 7 4
Net cash used in investing activities (2,385) (2,513) (3,142)
Cash flows from financing activities      
Issues of power bonds 2,122 1,126 1,587
Issues of variable interest entities 360 1,000 0
Redemptions and repurchases of power bonds (2,358) (2,717) (1,021)
Payments on debt of variable interest entities (13) (6) 0
Short-term debt issues (redemptions), net 924 1,024 455
Payments on leases and leasebacks (446) (84) (118)
Proceeds from call monetization 0 60 0
Financing costs, net (20) (75) (8)
Payments to U.S. Treasury (27) (27) (27)
Other, net (20) (1) 16
Net cash provided by financing activities 522 300 884
Net change in cash and cash equivalents 734 361 179
Cash and cash equivalents at beginning of the year 868 507 328
Cash and cash equivalents at end of the year $ 1,602 $ 868 $ 507