STATEMENTS OF CASH FLOWS (USD $) In Millions	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Cash flows from operating activities
Net income (loss)	$ 162	$ 972	$ 726
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	1,792	1,743	1,618
Nuclear refueling outage amortization cost	42	102	122
Amortization of nuclear fuel cost	225	238	216
Non-cash retirement benefit expense	465	364	146
Prepayment credits applied to revenue	(105)	(105)	(105)
Fuel cost adjustment deferral	69	(898)	850
Fuel cost tax equivalents	135	(89)	81
Environmental cleanup costs - Kingston ash spill - non cash	76	62	0
Changes in current assets and liabilities
Accounts receivable, net	(62)	(342)	90
Inventories and other, net	(110)	(119)	(182)
Accounts payable and accrued liabilities	60	308	23
Accrued interest	(4)	6	(40)
Pension contributions	(274)	(6)	(1,005)
Refueling outage costs	0	0	(128)
Environmental cleanup costs - Kingston ash spill, net	(108)	(369)	(231)
Other, net	74	34	(18)
Net cash provided by operating activities	2,437	1,901	2,163
Cash flows from investing activities
Construction expenditures	(2,417)	(2,015)	(1,793)
Combustion turbine asset acquisition	(436)	0	0
Nuclear fuel expenditures	(216)	(401)	(432)
Change in restricted cash and investments	(11)	0	(17)
Purchases of investments, net	(56)	(42)	(42)
Loans and other receivables
Advances	(21)	(25)	(13)
Repayments	11	21	11
Other, net	4	4	(1)
Net cash used in investing activities	(3,142)	(2,458)	(2,287)
Cash flows from financing activities
Issues	1,599	1,679	2,369
Redemptions and repurchases	(1,021)	(69)	(2,874)
Short-term debt issues (redemptions), net	455	(817)	659
Proceeds from sale/leaseback financing	5	11	104
Payments on leases and leaseback financing	(118)	(94)	(79)
Bond premium received	0	28	0
Financing costs, net	(20)	(23)	(33)
Payments to U.S. Treasury	(27)	(29)	(33)
Other	11	(2)	(1)
Net cash provided by financing activities	884	684	112
Net change in cash and cash equivalents	179	127	(12)
Cash and cash equivalents at beginning of year	328	201	213
Cash and cash equivalents at end of year	$ 507	$ 328	$ 201

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The net cash inflow or outflow from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net cash inflow or outflow from any material that is commonly used in the generation of nuclear energy.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow for loan and debt issuance costs.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method.

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The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller less the costs incurred in connection with the transaction, such as closing and deferred financing costs.

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