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BalanceAsOf_30Sep2010_Fair_Value_Inputs_Level1_Member_Other_Aggregated_Investments_Member 1 TwelveMonthsEnded_31Dec2010 2 BalanceAsOf_31Dec2009_Subsidiaries_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Member 1 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Six_Member_Equity_Securities_Member 5 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member_Fair_Value_Inputs_Level2_Member_Registrant_Subsidiary_Three_Member 1 BalanceAsOf_30Dec2009_Registrant_Subsidiary_One_Member 7 BalanceAsOf_30Sep2010_Electricity_Futures_Forwards_And_Swaps_Member_Non_Utility_Nuclear_Member_Other_Non_Current_Liabilities_Member 1 NineMonthsEnded_30Sep2010_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_Two_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Member 1 TwelveMonthsEnded_31Dec2009_Registrant_Subsidiary_One_Member 2 ThreeMonthsEnded_30Sep2009_Registrant_Subsidiary_Five_Member 2 ThreeMonthsEnded_30Sep2009_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_Four_Member 1 BalanceAsOf_31Dec2009_Equity_Securities_Member_Registrant_Subsidiary_One_Member 4 NineMonthsEnded_30Sep2010_Subsidiaries_Member 26 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Six_Member_Fair_Value_Inputs_Level2_Member 2 ThreeMonthsEnded_30Sep2010_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member 1 BalanceAsOf_30Sep2010_Series_Fourteen_Long_Term_Notes_Member_Registrant_Subsidiary_One_Member 2 NineMonthsEnded_30Sep2010_Grand_Gulf_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Five_Member 4 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level2_Member_Gas_Hedge_Contracts_Member 1 BalanceAsOf_30Sep2010_Equity_Securities_Member_Subsidiaries_Member 4 NineMonthsEnded_30Sep2010_Waterford_Three_Member 1 ThreeMonthsEnded_30Sep2010_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_Three_Member 1 NineMonthsEnded_30Sep2009_Treasury_Stock_Member 2 BalanceAsOf_31Dec2009_Debt_Securities_Member_Registrant_Subsidiary_One_Member 4 BalanceAsOf_30Sep2010_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Two_Member_Debt_Securities_Member 1 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_One_Member 12 NineMonthsEnded_30Sep2010_Electricity_Futures_Forwards_And_Swaps_Member 1 ThreeMonthsEnded_30Sep2010_Competitive_Businesses_Operating_Revenues_Member 1 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level3_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level2_Member 2 OneMonthEnded_30Nov2010_Subsidiaries_Member_Series_Eleven_Long_Term_Notes_Member 2 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Four_Member 3 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Variable_Interest_Entities_One_Member 4 BalanceAsOf_30Sep2010_Equity_Securities_Member_2 1 BalanceAsOf_30Sep2010_Securitization_Recovery_Trust_Account_Member_Registrant_Subsidiary_Five_Member_Fair_Value_Inputs_Level2_Member 1 BalanceAsOf_30Sep2010_Debt_Securities_Member_2 1 BalanceAsOf_31May2010_Subsidiaries_Member 2 BalanceAsOf_30Jun2010_Series_Thirteen_Long_Term_Notes_Member_Registrant_Subsidiary_One_Member 1 BalanceAsOf_30Sep2010_Fair_Value_Inputs_Level3_Member_Power_Contracts_Member 1 BalanceAsOf_30Sep2010_Fair_Value_Inputs_Level2_Member 1 BalanceAsOf_30Sep2010_Power_Contracts_Member_Fair_Value_Inputs_Level1_Member 1 ThreeMonthsEnded_30Sep2010_Electricity_Futures_Forwards_And_Swaps_De_Designated_As_Hedged_Items_Member_Competitive_Businesses_Operating_Revenues_Member 1 NineMonthsEnded_30Sep2009_Retained_Earnings_Member 3 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Three_Member_Credit_Facilities_One_Member 2 BalanceAsOf_22Jul2010_Registrant_Subsidiary_One_Member 1 BalanceAsOf_30Dec2009_Fair_Value_Inputs_Level1_Member_Equity_Securities_Member 1 NineMonthsEnded_30Sep2009_Registrant_Subsidiary_Two_Member 7 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Three_Member_Credit_Facilities_Two_Member 2 BalanceAsOf_30Sep2010_Registrant_Subsidiary_One_Member_Equity_Securities_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Four_Member_Fair_Value_Inputs_Level3_Member 2 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Four_Member_Other_Aggregated_Investments_Member 1 ThreeMonthsEnded_30Sep2009_Electricity_Futures_Forwards_And_Swaps_Member 1 BalanceAsOf_30Sep2010_Debt_Securities_Member_Registrant_Subsidiary_Two_Member 4 BalanceAsOf_31Dec2009_Equity_Securities_Member 4 ThreeMonthsEnded_30Sep2010_Subsidiaries_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 NineMonthsEnded_30Sep2009_Accumulated_Other_Comprehensive_Income_Member 9 BalanceAsOf_31Dec2009_Swap_Member_Prepayments_And_Other_Member_Registrant_Subsidiary_Three_Member 1 BalanceAsOf_31Dec2009_Swap_Member_Utility_Member_Prepayments_And_Other_Member 1 BalanceAsOf_30Sep2010_Securitization_Recovery_Trust_Account_Member 1 NineMonthsEnded_30Sep2009 110 BalanceAsOf_30Dec2009_Fair_Value_Inputs_Level2_Member_Equity_Securities_Member 1 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Variable_Interest_Entities_Two_Member 1 NineMonthsEnded_30Sep2009_Registrant_Subsidiary_Four_Member 2 BalanceAsOf_30Sep2010_Series_Two_Long_Term_Notes_Member_Registrant_Subsidiary_Variable_Interest_Entities_Four_Member 1 OneMonthEnded_30Nov2010_Registrant_Subsidiary_Two_Member_Series_Twenty_One_Long_Term_Notes_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Three_Member_Credit_Facilities_One_Member 2 BalanceAsOf_30Sep2010_Fair_Value_Inputs_Level2_Member_Debt_Securities_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Two_Member_Debt_Securities_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level2_Member_Other_Aggregated_Investments_Member 1 OneMonthEnded_30Jun2010_Registrant_Subsidiary_Five_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Six_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Member 1 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Two_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 6 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Three_Member 16 NineMonthsEnded_30Sep2010_Debt_Securities_Member 4 BalanceAsOf_31Dec2009_Securitization_Recovery_Trust_Account_Member_Registrant_Subsidiary_Five_Member 1 BalanceAsOf_30Sep2010_Swap_Member_Gas_Hedge_Contracts_Member_Registrant_Subsidiary_One_Member 1 NineMonthsEnded_30Sep2009_Eliminations_Member 2 BalanceAsOf_31Dec2009_Securitization_Recovery_Trust_Account_Member_Registrant_Subsidiary_Five_Member_Fair_Value_Inputs_Level1_Member 1 ThreeMonthsEnded_30Sep2009_Subsidiaries_Member_Pension_Plans_Defined_Benefit_Member 6 BalanceAsOf_22Jul2010_Registrant_Subsidiary_Two_Member 1 BalanceAsOf_30Sep2010_Power_Contracts_Member_Fair_Value_Inputs_Level3_Member 1 NineMonthsEnded_30Sep2010_Electricity_Futures_Forwards_And_Swaps_De_Designated_As_Hedged_Items_Member_Competitive_Businesses_Operating_Revenues_Member 1 NineMonthsEnded_30Sep2010_Series_Twelve_Long_Term_Notes_Member_Registrant_Subsidiary_Two_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Member 1 BalanceAsOf_30Dec2009_Fair_Value_Inputs_Level3_Member_Equity_Securities_Member 1 BalanceAsOf_30Sep2010_Series_Six_Long_Term_Notes_Member_Registrant_Subsidiary_Variable_Interest_Entities_Two_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Four_Member_Fair_Value_Inputs_Level2_Member 2 ThreeMonthsEnded_30Sep2009_Registrant_Subsidiary_Two_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 6 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Six_Member_Equity_Securities_Member 1 TwelveMonthsEnded_31Dec2009_Registrant_Subsidiary_Two_Member 2 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Three_Member_Other_Aggregated_Investments_Member 1 ThreeMonthsEnded_30Sep2010_Non_Utility_Nuclear_Member 3 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Seven_Member 1 NineMonthsEnded_30Sep2010_Equity_Securities_Member 5 TwelveMonthsEnded_31Dec2009_Debt_Securities_Member_Registrant_Subsidiary_One_Member 5 BalanceAsOf_30Sep2010_Swap_Member_Gas_Hedge_Contracts_Member_Registrant_Subsidiary_Three_Member 1 NineMonthsEnded_30Sep2009_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Four_Member_Other_Aggregated_Investments_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Three_Member_Fair_Value_Inputs_Level2_Member_Other_Aggregated_Investments_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Five_Member_Fair_Value_Inputs_Level2_Member 2 BalanceAsOf_31Dec2009_Debt_Securities_Member_Registrant_Subsidiary_Two_Member 4 BalanceAsOf_30Sep2010_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level3_Member_Other_Aggregated_Investments_Member 1 NineMonthsEnded_30Sep2010_Competitive_Businesses_Operating_Revenues_Member 1 ThreeMonthsEnded_31Mar2010 3 BalanceAsOf_30Dec2009_Power_Contracts_Member 1 TenMonthsEnded_31Oct2010_Registrant_Subsidiary_One_Member 1 BalanceAsOf_30Sep2010_Electricity_Futures_Forwards_And_Swaps_Member_Prepayments_And_Other_Member_Non_Utility_Nuclear_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level2_Member_Other_Aggregated_Investments_Member 1 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Two_Member_Series_Twenty_Long_Term_Notes_Member 1 ThreeMonthsEnded_30Sep2010_Utility_Member 3 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Four_Member_Fair_Value_Inputs_Level3_Member 2 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Six_Member_Fair_Value_Inputs_Level2_Member_Equity_Securities_Member 1 BalanceAsOf_31Dec2009_Debt_Securities_Member_Registrant_Subsidiary_Six_Member 4 BalanceAsOf_31Dec2008 3 BalanceAsOf_31Dec2008_Accumulated_Other_Comprehensive_Income_Member 1 BalanceAsOf_30Sep2010_Series_Eighteen_Long_Term_Notes_Member_Registrant_Subsidiary_One_Member 2 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Six_Member 20 ThreeMonthsEnded_30Sep2009_Registrant_Subsidiary_One_Member_Pension_Plans_Defined_Benefit_Member 6 NineMonthsEnded_30Sep2009_Registrant_Subsidiary_Two_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 6 TenMonthsEnded_31Oct2010_Subsidiaries_Member 1 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Three_Member 3 BalanceAsOf_30Sep2010_Series_Three_Long_Term_Notes_Member_Registrant_Subsidiary_Variable_Interest_Entities_One_Member 1 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Four_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 BalanceAsOf_30Sep2010_Debt_Securities_Member 4 NineMonthsEnded_30Sep2010_Pension_Plans_Defined_Benefit_Member 6 ThreeMonthsEnded_30Sep2009_Registrant_Subsidiary_Four_Member 2 BalanceAsOf_31Dec2009_Subsidiaries_Member_Fair_Value_Inputs_Level3_Member_Equity_Securities_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_One_Member_Gas_Hedge_Contracts_Member_2 1 NineMonthsEnded_30Sep2009_Registrant_Subsidiary_Three_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level2_Member 1 BalanceAsOf_30Sep2010_Fair_Value_Inputs_Level1_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level3_Member_Other_Aggregated_Investments_Member 1 NineMonthsEnded_30Sep2009_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_Four_Member 1 ThreeMonthsEnded_30Sep2010_Subsidiaries_Member 16 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Five_Member_Fair_Value_Inputs_Level2_Member 2 NineMonthsEnded_30Sep2009_Subsidiaries_Member_Pension_Plans_Defined_Benefit_Member 6 NineMonthsEnded_30Sep2009_All_Other_Member 3 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_One_Member_Pension_Plans_Defined_Benefit_Member 6 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member_Fair_Value_Inputs_Level3_Member_Registrant_Subsidiary_Three_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level2_Member_Gas_Hedge_Contracts_Member 1 BalanceAsOf_30Sep2010_Series_Seven_Long_Term_Notes_Member_Registrant_Subsidiary_Variable_Interest_Entities_Two_Member 1 BalanceAsOf_31Dec2009_Subsidiaries_Member 12 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Two_Member_Series_Twenty_Two_Long_Term_Notes_Member 1 ThreeMonthsEnded_30Sep2010_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_Two_Member 1 BalanceAsOf_31Dec2009_Subsidiaries_Member_Equity_Securities_Member 1 NineMonthsEnded_30Sep2010_Non_Utility_Nuclear_Member 3 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Three_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level2_Member 2 ThreeMonthsEnded_30Sep2009_Registrant_Subsidiary_One_Member 10 BalanceAsOf_30Sep2010_Securitization_Recovery_Trust_Account_Member_Fair_Value_Inputs_Level2_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Two_Member_Gas_Hedge_Contracts_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Member 1 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level1_Member 1 BalanceAsOf_30Sep2010_Series_Eight_Long_Term_Notes_Member_Registrant_Subsidiary_Variable_Interest_Entities_Four_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Three_Member_Fair_Value_Inputs_Level3_Member_Other_Aggregated_Investments_Member 1 ThreeMonthsEnded_30Sep2009_Registrant_Subsidiary_Four_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 BalanceAsOf_30Sep2010_Subsidiaries_Member 28 BalanceAsOf_30Sep2010_Fair_Value_Inputs_Level1_Member_Debt_Securities_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Six_Member_Equity_Securities_Member_2 1 BalanceAsOf_30Sep2010_Additional_Paid_In_Capital_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Three_Member_Other_Aggregated_Investments_Member 1 BalanceAsOf_30Sep2010_Equity_Securities_Member_Registrant_Subsidiary_One_Member 4 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Two_Member 41 BalanceAsOf_30Sep2009_Preferred_Stock_Member 1 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Two_Member_Pension_Plans_Defined_Benefit_Member 6 BalanceAsOf_31Dec2009_Gas_Hedge_Contracts_Member_Fair_Value_Inputs_Level3_Member_Registrant_Subsidiary_One_Member 1 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_One_Member_Natural_Gas_Processing_Plant_Member 2 BalanceAsOf_30Sep2010_Registrant_Subsidiary_One_Member_Other_Aggregated_Investments_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Six_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level1_Member_Debt_Securities_Member 1 NineMonthsEnded_30Sep2010_Retained_Earnings_Member 2 BalanceAsOf_30Nov2010_Series_Sixteen_Long_Term_Notes_Member_Registrant_Subsidiary_One_Member 2 BalanceAsOf_30Sep2010_Utility_Member 1 BalanceAsOf_30Sep2010_Power_Contracts_Member_Fair_Value_Inputs_Level2_Member 1 NineMonthsEnded_30Sep2009_Registrant_Subsidiary_Six_Member 4 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member 1 ThreeMonthsEnded_30Sep2010_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_One_Member 1 TwelveMonthsEnded_31Dec2007_Registrant_Subsidiary_Four_Member 1 BalanceAsOf_30Sep2010_Subsidiaries_Member_Fair_Value_Inputs_Level3_Member_Debt_Securities_Member 1 NineMonthsEnded_30Sep2009_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member 1 BalanceAsOf_31Dec2009_Securitization_Recovery_Trust_Account_Member_Registrant_Subsidiary_Five_Member_Fair_Value_Inputs_Level3_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Six_Member_Fair_Value_Inputs_Level3_Member 2 BalanceAsOf_31Dec2009_Equity_Securities_Member_Subsidiaries_Member 4 BalanceAsOf_30Sep2010_Series_Four_Long_Term_Notes_Member_Registrant_Subsidiary_Variable_Interest_Entities_One_Member 1 BalanceAsOf_31Dec2009_Treasury_Stock_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Four_Member_Fair_Value_Inputs_Level1_Member 2 BalanceAsOf_30Dec2009_Securitization_Recovery_Trust_Account_Member 1 BalanceAsOf_30Sep2009_All_Other_Member 1 BalanceAsOf_30Sep2010_Subsidiaries_Member_Fair_Value_Inputs_Level2_Member_Debt_Securities_Member 1 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member_Fair_Value_Inputs_Level1_Member_Registrant_Subsidiary_Three_Member 1 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Six_Member_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 BalanceAsOf_30Sep2010_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level1_Member_Equity_Securities_Member 1 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level1_Member_Other_Aggregated_Investments_Member 1 NineMonthsEnded_30Sep2010_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_Four_Member 1 TenMonthsEnded_31Oct2010_Registrant_Subsidiary_Four_Member 1 NineMonthsEnded_30Sep2010_Additional_Paid_In_Capital_Member 1 ThreeMonthsEnded_30Sep2010_Registrant_Subsidiary_Five_Member 5 BalanceAsOf_30Sep2009_Treasury_Stock_Member 1 BalanceAsOf_30Sep2010_Subsidiaries_Member_Equity_Securities_Member 1 BalanceAsOf_30Sep2010_Swap_Member_Gas_Hedge_Contracts_Member_Registrant_Subsidiary_Two_Member 1 BalanceAsOf_31Dec2008_Additional_Paid_In_Capital_Member 1 NineMonthsEnded_30Sep2010_All_Other_Member 3 NineMonthsEnded_30Sep2010_Treasury_Stock_Member 2 BalanceAsOf_30Sep2010_Registrant_Subsidiary_Four_Member 8 TwelveMonthsEnded_31Dec2009_Equity_Securities_Member_Registrant_Subsidiary_Two_Member 4 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level1_Member_Gas_Hedge_Contracts_Member 1 ThreeMonthsEnded_30Sep2009_Other_Postretirement_Benefit_Plans_Defined_Benefit_Member 7 NineMonthsEnded_30Sep2009_Registrant_Subsidiary_Three_Member 2 BalanceAsOf_30Dec2009_Fair_Value_Inputs_Level3_Member 2 BalanceAsOf_30Sep2010_Fair_Value_Inputs_Level3_Member_Other_Aggregated_Investments_Member 1 BalanceAsOf_30Sep2010_Debt_Securities_Member_Subsidiaries_Member 4 BalanceAsOf_30Sep2010_Gas_Hedge_Contracts_Member_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level1_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Two_Member_Fair_Value_Inputs_Level1_Member_Other_Aggregated_Investments_Member 1 NineMonthsEnded_30Sep2010_Registrant_Subsidiary_Three_Member_Credit_Facilities_Three_Member 2 BalanceAsOf_30Sep2010_Series_Twelve_Long_Term_Notes_Member_Registrant_Subsidiary_Two_Member 1 NineMonthsEnded_30Sep2010_Swap_Member_Fuel_Fuel_Related_Expenses_And_Gas_Purchased_For_Resale_Member_Registrant_Subsidiary_Three_Member 1 BalanceAsOf_31Dec2009_Registrant_Subsidiary_One_Member_Fair_Value_Inputs_Level2_Member 2 BalanceAsOf_31Dec2009_Registrant_Subsidiary_Three_Member_Fair_Value_Inputs_Level2_Member_Gas_Hedge_Contracts_Member 1 TenMonthsEnded_31Oct2010 2 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