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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Operating revenues
Revenue from the sales of electricity	$ 2,375us-gaap_ElectricUtilityRevenue	$ 2,350us-gaap_ElectricUtilityRevenue
Other revenue	36us-gaap_OtherSalesRevenueNet	32us-gaap_OtherSalesRevenueNet
Total operating revenues	2,411us-gaap_SalesRevenueNet	2,382us-gaap_SalesRevenueNet
Operating expenses
Fuel	550us-gaap_UtilitiesOperatingExpenseFuelUsed	543us-gaap_UtilitiesOperatingExpenseFuelUsed
Purchased power	233us-gaap_UtilitiesOperatingExpensePurchasedPower	251us-gaap_UtilitiesOperatingExpensePurchasedPower
Operating and maintenance	688us-gaap_OtherCostAndExpenseOperating	807us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization	452us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization	441us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Tax equivalents	124us-gaap_UtilitiesOperatingExpenseTaxes	122us-gaap_UtilitiesOperatingExpenseTaxes
Total operating expenses	2,047us-gaap_OperatingExpenses	2,164us-gaap_OperatingExpenses
Operating income	364us-gaap_OperatingIncomeLoss	218us-gaap_OperatingIncomeLoss
Other income (expense), net	9us-gaap_OtherNonoperatingIncomeExpense	14us-gaap_OtherNonoperatingIncomeExpense
Interest expense
Interest expense	342us-gaap_InterestAndDebtExpense	339us-gaap_InterestAndDebtExpense
Allowance for funds used during construction	(50)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	(40)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions
Net interest expense	292us-gaap_InterestExpense	299us-gaap_InterestExpense
Net income (loss)	$ 81us-gaap_NetIncomeLoss	$ (67)us-gaap_NetIncomeLoss

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The aggregate revenue, whether regulated or unregulated, derived from the generation, transmission and distribution of electricity.

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