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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Operating revenues
Revenue from the sales of electricity	$ 2,825us-gaap_ElectricUtilityRevenue	$ 2,901us-gaap_ElectricUtilityRevenue	$ 5,200us-gaap_ElectricUtilityRevenue	$ 5,251us-gaap_ElectricUtilityRevenue
Other revenue	38us-gaap_OtherSalesRevenueNet	37us-gaap_OtherSalesRevenueNet	74us-gaap_OtherSalesRevenueNet	69us-gaap_OtherSalesRevenueNet
Total operating revenues	2,863us-gaap_SalesRevenueNet	2,938us-gaap_SalesRevenueNet	5,274us-gaap_SalesRevenueNet	5,320us-gaap_SalesRevenueNet
Operating expenses
Fuel	586us-gaap_UtilitiesOperatingExpenseFuelUsed	663us-gaap_UtilitiesOperatingExpenseFuelUsed	1,136us-gaap_UtilitiesOperatingExpenseFuelUsed	1,206us-gaap_UtilitiesOperatingExpenseFuelUsed
Purchased power	259us-gaap_UtilitiesOperatingExpensePurchasedPower	313us-gaap_UtilitiesOperatingExpensePurchasedPower	492us-gaap_UtilitiesOperatingExpensePurchasedPower	564us-gaap_UtilitiesOperatingExpensePurchasedPower
Operating and maintenance	657us-gaap_OtherCostAndExpenseOperating	793us-gaap_OtherCostAndExpenseOperating	1,345us-gaap_OtherCostAndExpenseOperating	1,600us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization	454us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization	453us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization	906us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization	894us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Tax equivalents	131us-gaap_UtilitiesOperatingExpenseTaxes	140us-gaap_UtilitiesOperatingExpenseTaxes	255us-gaap_UtilitiesOperatingExpenseTaxes	262us-gaap_UtilitiesOperatingExpenseTaxes
Total operating expenses	2,087us-gaap_OperatingExpenses	2,362us-gaap_OperatingExpenses	4,134us-gaap_OperatingExpenses	4,526us-gaap_OperatingExpenses
Operating income	776us-gaap_OperatingIncomeLoss	576us-gaap_OperatingIncomeLoss	1,140us-gaap_OperatingIncomeLoss	794us-gaap_OperatingIncomeLoss
Other income (expense), net	8us-gaap_OtherNonoperatingIncomeExpense	13us-gaap_OtherNonoperatingIncomeExpense	17us-gaap_OtherNonoperatingIncomeExpense	27us-gaap_OtherNonoperatingIncomeExpense
Interest expense
Interest expense	341us-gaap_InterestAndDebtExpense	336us-gaap_InterestAndDebtExpense	683us-gaap_InterestAndDebtExpense	675us-gaap_InterestAndDebtExpense
Allowance for funds used during construction	(53)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	(42)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	(103)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	(82)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions
Net interest expense	288us-gaap_InterestExpense	294us-gaap_InterestExpense	580us-gaap_InterestExpense	593us-gaap_InterestExpense
Net income (loss)	$ 496us-gaap_NetIncomeLoss	$ 295us-gaap_NetIncomeLoss	$ 577us-gaap_NetIncomeLoss	$ 228us-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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