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'Monetary' elements on report '000665 - Disclosure - Leases (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '000670 - Disclosure - Financing Activities (Details)' had a mix of different decimal attribute values. 'Shares' elements on report '000675 - Disclosure - Stock-Based Compensation (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '000675 - Disclosure - Stock-Based Compensation (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '000680 - Disclosure - Property, Plant and Equipment (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '000690 - Disclosure - Unaudited Quarterly Financial Information (Details)' had a mix of different decimal attribute values. Process Flow-Through: 000110 - 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: 000115 - Statement - Consolidated Statements of Comprehensive Income (Loss) 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: 000116 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) Process Flow-Through: 000130 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 000131 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 000140 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: 000458 - Statement - Income Taxes (Policies) aep-20111231.xml aep-20111231.xsd aep-20111231_cal.xml aep-20111231_def.xml aep-20111231_lab.xml aep-20111231_pre.xml true true