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Element us-gaap_ProceedsFromPaymentsForOtherFinancingActivities had a mix of decimals attribute values: -6 -3. Element us-gaap_ProceedsFromPollutionControlBond had a mix of decimals attribute values: -6 -3. Element us-gaap_ProceedsFromRepaymentsOfShortTermDebt had a mix of decimals attribute values: -6 -3. Element us-gaap_ProceedsFromSaleOfProductiveAssets had a mix of decimals attribute values: -6 -3. Element us-gaap_ProfitLoss had a mix of decimals attribute values: -6 -3. Element us-gaap_PropertyPlantAndEquipmentGross had a mix of decimals attribute values: -6 -3. Element us-gaap_PropertyPlantAndEquipmentNet had a mix of decimals attribute values: -6 -3. Element us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity had a mix of decimals attribute values: -6 -3. Element us-gaap_RecognitionOfDeferredRevenue had a mix of decimals attribute values: -6 -3. Element us-gaap_RepaymentsOfOtherLongTermDebt had a mix of decimals attribute values: -6 -3. Element us-gaap_RepaymentsOfSeniorDebt had a mix of decimals attribute values: -6 -3. Element us-gaap_RestrictedCashAndInvestmentsCurrent had a mix of decimals attribute values: -6 -3. Element us-gaap_RetainedEarningsAccumulatedDeficit had a mix of decimals attribute values: -6 -3. Element us-gaap_Revenues had a mix of decimals attribute values: -6 -3. Element us-gaap_ShortTermBorrowings had a mix of decimals attribute values: -6 -3. Element us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest had a mix of decimals attribute values: -6 -3. Element us-gaap_StockholdersEquityOther had a mix of decimals attribute values: -6 -3. Element us-gaap_StockIssuedDuringPeriodValueNewIssues had a mix of decimals attribute values: -6 -3. Element us-gaap_StockOptionPlanExpense had a mix of decimals attribute values: -6 -3. Element us-gaap_TaxesExcludingIncomeAndExciseTaxes had a mix of decimals attribute values: -6 -3. Element us-gaap_UtilitiesOperatingExpenseFuelUsed had a mix of decimals attribute values: -6 -3. Element us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations had a mix of decimals attribute values: -6 -3. 'Monetary' elements on report '0110 - Statement - Consolidated Statements of Income' had a mix of different decimal attribute values. 'Monetary' elements on report '0120 - Statement - Consolidated Statements of Comprehensive Income' had a mix of different decimal attribute values. 'Monetary' elements on report '0121 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical)' had a mix of different decimal attribute values. 'Monetary' elements on report '0130 - Statement - Consolidated Statements of Cash Flows' had a mix of different decimal attribute values. 'Monetary' elements on report '0140 - Statement - Consolidated Balance Sheets' had a mix of different decimal attribute values. 'Monetary' elements on report '0150 - Statement - Consolidated Statements of Capitalization' had a mix of different decimal attribute values. 'Monetary' elements on report '0160 - Statement - Consolidated Statements of Common Stockholders Equity' had a mix of different decimal attribute values. 'Monetary' elements on report '06015 - Disclosure - Summary of Significant Accounting Policies (Details 5)' had a mix of different decimal attribute values. 'Monetary' elements on report '06016 - Disclosure - Summary of Significant Accounting Policies (Details 6)' had a mix of different decimal attribute values. 'Monetary' elements on report '060204 - Disclosure - Retirement Benefits (Details 4)' had a mix of different decimal attribute values. 'Monetary' elements on report '060207 - Disclosure - Retirement Benefits (Details 7)' had a mix of different decimal attribute values. 'Monetary' elements on report '060213 - Disclosure - Retirement Benefits (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '0603 - Disclosure - Contingencies and Regulatory Matters (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '06051 - Disclosure - Income Taxes (Details 1)' had a mix of different decimal attribute values. 'Monetary' elements on report '06063 - Disclosure - Financing (DetailsTextual)' had a mix of different decimal attribute values. 'Monetary' elements on report '06071 - Disclosure - Commitments (Details Textual)' had a mix of different decimal attribute values. 'Shares' elements on report '06083 - Disclosure - Common Stock (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '06083 - Disclosure - Common Stock (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '0609 - Disclosure - Nuclear Insurance (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '06113 - Disclosure - Derivatives (Details 3)' had a mix of different decimal attribute values. 'Monetary' elements on report '0612 - Disclosure - Segment and Related Information (Details)' had a mix of different decimal attribute values. Process Flow-Through: 0110 - Statement - Consolidated Statements of Income Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2010' Process Flow-Through: 0120 - Statement - Consolidated Statements of Comprehensive Income Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2010' Process Flow-Through: 0121 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Process Flow-Through: 0130 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: 0131 - Statement - Consolidated Statements of Cash Flows (Parenthetical) Process Flow-Through: 0140 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 0141 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Oct. 20, 2011' Process Flow-Through: 0150 - Statement - Consolidated Statements of Capitalization Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 2015' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 2015' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 2016' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 2016' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 2014' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 2014' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 2013' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 2013' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 2012' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 2012' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 2011' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 2011' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 Adjustable Rate Loans [Member] 2013' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 Adjustable Rate Loans [Member] 2013' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 Adjustable Rate Loans [Member] 2012' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 Adjustable Rate Loans [Member] 2012' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 Adjustable Rate Loans [Member] 2011' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 Adjustable Rate Loans [Member] 2011' Process Flow-Through: Removing column 'Dec. 31, 2009 Alabama Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2008 Alabama Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2011 Alabama Power [Member] 2016' Process Flow-Through: Removing column 'Dec. 31, 2010 Alabama Power [Member] 2016' Process Flow-Through: Removing column 'Dec. 31, 2011 Alabama Power [Member] 2013' Process Flow-Through: Removing column 'Dec. 31, 2010 Alabama Power [Member] 2013' Process Flow-Through: Removing column 'Dec. 31, 2011 Alabama Power [Member] 2012' Process Flow-Through: Removing column 'Dec. 31, 2010 Alabama Power [Member] 2012' Process Flow-Through: Removing column 'Dec. 31, 2011 Alabama Power [Member] 2011' Process Flow-Through: Removing column 'Dec. 31, 2010 Alabama Power [Member] 2011' Process Flow-Through: Removing column 'Dec. 31, 2009 Georgia Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2008 Georgia Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2011 Georgia Power [Member] 2044' Process Flow-Through: Removing column 'Dec. 31, 2010 Georgia Power [Member] 2044' Process Flow-Through: Removing column 'Dec. 31, 2011 Georgia Power [Member] 2015' Process Flow-Through: Removing column 'Dec. 31, 2010 Georgia Power [Member] 2015' Process Flow-Through: Removing column 'Dec. 31, 2011 Georgia Power [Member] 2016' Process Flow-Through: Removing column 'Dec. 31, 2010 Georgia Power [Member] 2016' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 Georgia Power [Member] 2013' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 Georgia Power [Member] 2013' Process Flow-Through: Removing column 'Dec. 31, 2011 Georgia Power [Member] 2012' Process Flow-Through: Removing column 'Dec. 31, 2010 Georgia Power [Member] 2012' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011 Georgia Power [Member] 2011' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010 Georgia Power [Member] 2011' Process Flow-Through: Removing column 'Dec. 31, 2009 Gulf Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2008 Gulf Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2011 Gulf Power [Member] 2016' Process Flow-Through: Removing column 'Dec. 31, 2010 Gulf Power [Member] 2016' Process Flow-Through: Removing column 'Dec. 31, 2011 Gulf Power [Member] 2014' Process Flow-Through: Removing column 'Dec. 31, 2010 Gulf Power [Member] 2014' Process Flow-Through: Removing column 'Dec. 31, 2011 Gulf Power [Member] 2013' Process Flow-Through: Removing column 'Dec. 31, 2010 Gulf Power [Member] 2013' Process Flow-Through: Removing column 'Dec. 31, 2010 Gulf Power [Member] 2011' Process Flow-Through: Removing column 'Oct. 20, 2011 Mississippi Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2009 Mississippi Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2008 Mississippi Power [Member]' Process Flow-Through: Removing column 'Dec. 31, 2011 Mississippi Power [Member] 2016' Process Flow-Through: Removing column 'Dec. 31, 2010 Mississippi Power [Member] 2016' Process Flow-Through: Removing column 'Dec. 31, 2011 Mississippi Power [Member] 2013' Process Flow-Through: Removing column 'Dec. 31, 2010 Mississippi Power [Member] 2013' Process Flow-Through: 0151 - Statement - Consolidated Statements of Capitalization (Parenthetical) Process Flow-Through: Removing column 'Oct. 20, 2011' so-20111231.xml so-20111231.xsd so-20111231_cal.xml so-20111231_def.xml so-20111231_lab.xml so-20111231_pre.xml true true