Rate Matters (Details) (USD $)																																																																																																			3 Months Ended			3 Months Ended			3 Months Ended				3 Months Ended												3 Months Ended		3 Months Ended																3 Months Ended				3 Months Ended		3 Months Ended				1 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2012 Regulatory Assets Not Yet Being Recovered [Member]	Mar. 31, 2013 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Dec. 31, 2012 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Mar. 31, 2013 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Deferred Wind Power Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Deferred Wind Power Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Dec. 31, 2012 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Mar. 31, 2013 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Litigation Settlement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Litigation Settlement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Dec. 31, 2012 Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Mar. 31, 2013 Ormet Delayed Payment Arrangement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Ormet Delayed Payment Arrangement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member]	Dec. 31, 2012 Appalachian Power Co [Member]	Mar. 31, 2013 Appalachian Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Deferred Wind Power Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Deferred Wind Power Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Dresden Plant Operating Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Dresden Plant Operating Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Transmission Agreement Phase-In [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Transmission Agreement Phase-In [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Appalachian Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Appalachian Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Southwestern Electric Power Co [Member]	Dec. 31, 2012 Southwestern Electric Power Co [Member]	Mar. 31, 2013 Southwestern Electric Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Southwestern Electric Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Southwestern Electric Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Southwestern Electric Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Southwestern Electric Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Southwestern Electric Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Southwestern Electric Power Co [Member] Rate Case Expenses [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Southwestern Electric Power Co [Member] Rate Case Expenses [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Southwestern Electric Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Southwestern Electric Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Southwestern Electric Power Co [Member] Under-recovered Environmental Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Dec. 31, 2012 Southwestern Electric Power Co [Member] Under-recovered Environmental Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Mar. 31, 2013 Ohio Power Co [Member]	Dec. 31, 2012 Ohio Power Co [Member]	Mar. 31, 2013 Ohio Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Ohio Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Ohio Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Ohio Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Ohio Power Co [Member] Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Dec. 31, 2012 Ohio Power Co [Member] Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return	Mar. 31, 2013 Ohio Power Co [Member] Ormet Delayed Payment Arrangement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Ohio Power Co [Member] Ormet Delayed Payment Arrangement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Ohio Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Ohio Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Public Service Co Of Oklahoma [Member]	Dec. 31, 2012 Public Service Co Of Oklahoma [Member]	Mar. 31, 2013 Public Service Co Of Oklahoma [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Public Service Co Of Oklahoma [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Public Service Co Of Oklahoma [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Public Service Co Of Oklahoma [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Public Service Co Of Oklahoma [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Public Service Co Of Oklahoma [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Indiana Michigan Power Co [Member]	Dec. 31, 2012 Indiana Michigan Power Co [Member]	Mar. 31, 2013 Indiana Michigan Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Indiana Michigan Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Indiana Michigan Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Indiana Michigan Power Co [Member] Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Indiana Michigan Power Co [Member] Litigation Settlement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Indiana Michigan Power Co [Member] Litigation Settlement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Indiana Michigan Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Indiana Michigan Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Indiana Michigan Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Indiana Michigan Power Co [Member] Medicare Part D [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Indiana Michigan Power Co [Member] Under-recovered Capacity Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Dec. 31, 2012 Indiana Michigan Power Co [Member] Under-recovered Capacity Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member]	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member] Deferred Capacity Costs [Member]	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member] Deferred Fuel Costs [Member]	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member]	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member] Deferred Capacity Costs [Member]	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member] Deferred Fuel Costs [Member]	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member] Significantly Excessive Earnings Test - 2010 [Member]	Mar. 31, 2013 Ohio Electric Security Plan Filing [Member] Significantly Excessive Earnings Test - 2010 [Member] Ohio Power Co [Member]	Mar. 31, 2013 Storm Damage Recovery Rider [Member] Storm Costs [Member]	Mar. 31, 2013 Storm Damage Recovery Rider [Member] Ohio Power Co [Member] Storm Costs [Member]	Mar. 31, 2013 Ohio Fuel Adjustment Clause Audit - 2009 [Member]	Mar. 31, 2013 Ohio Fuel Adjustment Clause Audit - 2009 [Member] Ohio Power Co [Member]	Mar. 31, 2013 Ohio Fuel Adjustment Clause Audit - 2010 and 2011 [Member]	Mar. 31, 2013 Ohio Fuel Adjustment Clause Audit - 2010 and 2011 [Member] Ohio Power Co [Member]	Mar. 31, 2013 Ormet Interim Arrangement [Member]	Mar. 31, 2013 Ormet Interim Arrangement [Member] Ohio Power Co [Member]	Mar. 31, 2013 Special Rate Mechanism For Ormet [Member]	Mar. 31, 2013 Special Rate Mechanism For Ormet [Member] Ohio Power Co [Member]	Mar. 31, 2013 Ohio IGCC Plant [Member]	Mar. 31, 2013 Ohio IGCC Plant [Member] Ohio Power Co [Member]	Mar. 31, 2013 Turk Plant [Member]	Mar. 31, 2013 Turk Plant [Member] Electric Transmission [Member]	Mar. 31, 2013 Turk Plant [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Turk Plant [Member] Southwestern Electric Power Co [Member] Electric Transmission [Member]	Mar. 31, 2013 Texas Base Rate Case [Member]	Mar. 31, 2013 Texas Base Rate Case [Member] Minimum [Member]	Mar. 31, 2013 Texas Base Rate Case [Member] Maximum [Member]	Mar. 31, 2013 Texas Base Rate Case [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Texas Base Rate Case [Member] Southwestern Electric Power Co [Member] Minimum [Member]	Mar. 31, 2013 Texas Base Rate Case [Member] Southwestern Electric Power Co [Member] Maximum [Member]	Mar. 31, 2013 Louisiana 2012 Formula Rate Filing [Member]	Mar. 31, 2013 Louisiana 2012 Formula Rate Filing [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 Flint Creek Plant Environmental Controls [Member]	Mar. 31, 2013 Flint Creek Plant Environmental Controls [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2013 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member]	Mar. 31, 2013 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Mar. 31, 2013 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member]	Mar. 31, 2013 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member] Appalachian Power Co [Member]	Mar. 31, 2013 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member]	Mar. 31, 2013 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Mar. 31, 2013 West Virginia Expanded Net Energy Charge [Member]	Mar. 31, 2013 West Virginia Expanded Net Energy Charge [Member] Appalachian Power Co [Member]	Mar. 31, 2013 Oklahoma Environmental Compliance Plan [Member]	Mar. 31, 2013 Oklahoma Environmental Compliance Plan [Member] Northeastern Station Units 3 and 4 [Member]	Mar. 31, 2013 Oklahoma Environmental Compliance Plan [Member] Public Service Co Of Oklahoma [Member]	Mar. 31, 2013 Oklahoma Environmental Compliance Plan [Member] Public Service Co Of Oklahoma [Member] Northeastern Station Units 3 and 4 [Member]	Mar. 31, 2013 Cook Plant Life Cycle Management Project [Member]	Mar. 31, 2013 Cook Plant Life Cycle Management Project [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2013 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member]	Mar. 31, 2013 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member] Indiana Michigan Power Co [Member]	Apr. 26, 2013 Plant Transfer [Member] Subsequent Event [Member]	Mar. 31, 2013 Plant Transfer [Member] Costs Incurred Related to FGD Project [Member] Big Sandy Plant Unit 2 FGD Project [Member]	Mar. 31, 2013 Virginia Environmental Rate Adjustment Clause [Member]	Mar. 31, 2013 Virginia Environmental Rate Adjustment Clause [Member] Appalachian Power Co [Member]	Mar. 31, 2013 Virginia Generation Rate Adjustment Clause [Member] Dresden Plant [Member]	Mar. 31, 2013 Virginia Generation Rate Adjustment Clause [Member] Appalachian Power Co [Member] Dresden Plant [Member]	Mar. 31, 2013 Rockport Plant CCT Project [Member]	Mar. 31, 2013 Rockport Plant CCT Project [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2013 Indiana Base Rate Case [Member]	Mar. 31, 2013 Indiana Base Rate Case [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2013 Virginia Storm Costs [Member]	Mar. 31, 2013 Virginia Storm Costs [Member] Appalachian Power Co [Member]
Regulatory Assets Not Being Recovered [Abstract]
Regulatory Assets, Noncurrent	$ 5,087,000,000	$ 5,106,000,000	$ 333,000,000	$ 304,000,000	$ 23,000,000	$ 23,000,000	$ 141,000,000	$ 172,000,000	$ 14,000,000	$ 14,000,000	$ 27,000,000	$ 29,000,000	$ 5,000,000	$ 5,000,000	$ 2,000,000	$ 1,000,000	$ 32,000,000	$ 31,000,000	$ 0	$ 11,000,000	$ 13,000,000	$ 13,000,000	$ 20,000,000	$ 5,000,000	$ 56,000,000	$ 0	$ 1,372,601,000	$ 1,435,704,000	$ 132,817,000	$ 157,560,000	$ 63,685,000	$ 94,458,000	$ 14,155,000	$ 14,155,000	$ 26,977,000	$ 29,320,000	$ 5,112,000	$ 5,143,000	$ 2,646,000	$ 1,447,000	$ 8,760,000	$ 8,758,000	$ 3,129,000	$ 2,992,000	$ 1,287,000	$ 1,287,000	$ 7,066,000	$ 0	$ 406,339,000	$ 403,278,000	$ 16,749,000	$ 9,000,000	$ 2,276,000	$ 2,188,000	$ 2,295,000	$ 2,295,000	$ 5,758,000	$ 4,517,000	$ 6,400,000	$ 0	$ 20,000	$ 0	$ 1,462,357,000	$ 1,420,966,000	$ 105,986,000	$ 80,524,000	$ 59,758,000	$ 61,828,000	$ 469,000	$ 30,000	$ 13,373,000	$ 13,213,000	$ 20,000,000	$ 5,453,000	$ 12,386,000	$ 0	$ 197,064,000	$ 202,328,000	$ 6,582,000	$ 423,000	$ 703,000	$ 423,000	$ 5,879,000	$ 0	$ 546,013,000	$ 540,019,000	$ 16,060,000	$ 13,264,000	$ 1,094,000	$ 786,000	$ 0	$ 11,098,000	$ 0	$ 1,380,000	$ 12,242,000	$ 0	$ 2,724,000	$ 0		$ 116,000,000	$ 501,000,000		$ 116,000,000	$ 501,000,000			$ 61,000,000	$ 61,000,000							$ 20,000,000	$ 20,000,000																							$ 287,000,000	$ 287,000,000											$ 28,000,000	$ 28,000,000	$ 4,000,000	$ 4,000,000
Rate Matters (Textuals) [Abstract]
Regulatory Assets, Noncurrent	5,087,000,000	5,106,000,000	333,000,000	304,000,000	23,000,000	23,000,000	141,000,000	172,000,000	14,000,000	14,000,000	27,000,000	29,000,000	5,000,000	5,000,000	2,000,000	1,000,000	32,000,000	31,000,000	0	11,000,000	13,000,000	13,000,000	20,000,000	5,000,000	56,000,000	0	1,372,601,000	1,435,704,000	132,817,000	157,560,000	63,685,000	94,458,000	14,155,000	14,155,000	26,977,000	29,320,000	5,112,000	5,143,000	2,646,000	1,447,000	8,760,000	8,758,000	3,129,000	2,992,000	1,287,000	1,287,000	7,066,000	0	406,339,000	403,278,000	16,749,000	9,000,000	2,276,000	2,188,000	2,295,000	2,295,000	5,758,000	4,517,000	6,400,000	0	20,000	0	1,462,357,000	1,420,966,000	105,986,000	80,524,000	59,758,000	61,828,000	469,000	30,000	13,373,000	13,213,000	20,000,000	5,453,000	12,386,000	0	197,064,000	202,328,000	6,582,000	423,000	703,000	423,000	5,879,000	0	546,013,000	540,019,000	16,060,000	13,264,000	1,094,000	786,000	0	11,098,000	0	1,380,000	12,242,000	0	2,724,000	0		116,000,000	501,000,000		116,000,000	501,000,000			61,000,000	61,000,000							20,000,000	20,000,000																							287,000,000	287,000,000											28,000,000	28,000,000	4,000,000	4,000,000
Unrecognized Equity Carrying Costs																																																																																																																																											4,000,000	4,000,000											11,000,000	11,000,000	3,000,000	3,000,000
Intervenors' Recommended Additional Refund of Excessive Earnings																																																																																																									62,000,000	62,000,000
Future Commitment to Support the Development of a Large Solar Farm																																																																																																			20,000,000			20,000,000
Commission Staff's Recommended Refund of Excessive Earnings																																																																																																									23,000,000	23,000,000
Percentage of Standard Service Offer Load Which Registrant Will Conduct an Energy Only Auction for Delivery through May 2015																																																																																																			10.00%			10.00%
Additional Percentage of Standard Service Offer Load Which Registrant Will Conduct an Energy Only Auction for Delivery Beginning June 2014 through May 2015																																																																																																			50.00%			50.00%
Remaining Percentage of Standard Service Offer Load Which Registrant Will Conduct an Energy Only Auction for Delivery from January 2015 through May 2015																																																																																																			40.00%			40.00%
PUCO-Determined Fixed Price per MW Day for Customers Who Switch During ESP Period																																																																																																			188.88			188.88
Reliability Pricing Model Rate per MW Day in Effect Through May 2013																																																																																																			20			20
Reliability Pricing Model Rate per MW Day in Effect June 2013 through May 2014																																																																																																			33			33
Total Amount Provided by the Retail Stability Rider																																																																																																			500,000,000			500,000,000
Retail Stability Rider through May 2014 ($ Per MWh)																																																																																																			3.50			3.50
Retail Stability Rider for the Period June 2014 through May 2015 ($ per MWh)																																																																																																			4.00			4.00
Amount of Retail Stability Rider Applied to the Deferred Capacity Costs for the Period June 2014 through May 2015 ($ per MWh)																																																																																																			1.00			1.00
2008 Coal Contract Settlement Proceeds to be Applied to Deferred Fuel Adjustment Clause as Orginially Ordered by the PUCO																																																																																																													65,000,000	65,000,000
Favorable Fuel Adjustment Recorded in the Second Quarter of 2012 Based on Fuel Adjustment Clause Audit Rehearing																																																																																																													30,000,000	30,000,000
Remaining Retail Gain Not Already Flowed Through Fuel Adjustment Clause																																																																																																													35,000,000	35,000,000
Potential Refund of Carrying Costs																																																																																																															35,000,000	35,000,000
Potential Refund of Unrecognized Equity Carrying Costs																																																																																																															18,000,000	18,000,000
Deferred Fuel Adjustment Clause Related to Ormet Interim Arrangement as of September 2009																																																																																																																	64,000,000	64,000,000
Unrecognized Equity Carrying Costs Related to Ormet Interim Arrangement as of September 2009																																																																																																																	2,000,000	2,000,000
Ormet's October and November 2012 Power Billings																																																																																																																			27,000,000	27,000,000
Maximum Amount of Ormet's October and November 2012 Unpaid Balance Allowed to be Recovered in the Economic Development Rider																																																																																																																			20,000,000	20,000,000
Net Receivable Related to the Special Rate Mechanism for Ormet																																																																																																																			6,000,000	6,000,000
Collection of Authorized Pre-Construction Costs																																																																																																																					24,000,000	24,000,000
Subsidiary's Ownership Percentage																																																																																																																							73.00%		73.00%
Asset Impairments and Other Related Charges																																																																																																																							62,000,000		62,000,000
Construction Work in Progress	2,078,000,000	1,819,000,000																									271,320,000	266,247,000																					130,614,000	99,783,000													348,366,000	354,497,000													99,494,000	95,170,000							375,413,000	341,063,000																																	1,700,000,000	120,000,000	1,700,000,000	120,000,000									16,000,000	16,000,000													197,000,000	197,000,000									61,000,000	31,000,000
Capitalized AFUDC and Interest Excluding Costs Attributable to its Joint Owners																																																																																																																							328,000,000		328,000,000
Arkansas Jurisdictional Share of the Turk Plant																																																																																																																							20.00%		20.00%
The PUCT Required Cap on the Plant, Excluding AFUDC and Related Transmission Costs																																																																																																																							1,522,000,000		1,522,000,000
The PUCT Required Cap on CO2 Emission Costs (per ton)																																																																																																																							28		28
Requested Base Rate Increase																																																																																																																											83,000,000			83,000,000
Requested Return on Equity																																																																																																																											11.25%			11.25%
Texas Jurisdictional Share of the Turk Plant																																																																																																																											33.00%			33.00%
Intervenors' Recommended Base Rate Increase																																																																																																																												16,000,000	51,000,000		16,000,000	51,000,000
Intervenors' Recommended Return on Equity																																																																																																																												9.00%	9.55%		9.00%	9.55%
Louisiana Jurisdictional Share of the Turk Plant																																																																																																																																	29.00%	29.00%
Increase in Louisiana Total Rates per the Settlement Agreement																																																																																																																																	2,000,000	2,000,000
Base Rate Increase per the Settlement Agreement																																																																																																																																	85,000,000	85,000,000
Fuel Rate Decrease per the Settlement Agreement																																																																																																																																	83,000,000	83,000,000
Return on Common Equity per the Settlement Agreement																																																																																																																																	10.00%	10.00%
Projected Capital Costs																																																																																																																																			408,000,000	408,000,000													1,200,000,000	1,200,000,000									285,000,000	142,000,000
Subsidary's Portion of Projected Capital Costs																																																																																																																																			204,000,000	204,000,000
Amount of Deferred Preconstruction IGCC Costs for Future Recovery																																																																																																																																					9,000,000	9,000,000	2,000,000	2,000,000	10,000,000	10,000,000
Requested Recovery Of 2011 and 2012 Environmental Compliance Costs																																																																																																																																																							39,000,000	39,000,000
Requested Increase in Virginia Generation RAC Revenues Related to the Dresden Plant																																																																																																																																																									12,000,000	12,000,000
Total Annual Increase to Collect Costs Related to the Dresden Plant																																																																																																																																																									38,000,000	38,000,000
Write-off of Regulatory Asset, Pretax																																																																																																																																																															30,000,000	30,000,000
Requested Expanded Net Energy Charge Securitization																																																																																																																																											422,000,000	422,000,000
Requested Other Expanded Net Energy Charge Related Assets																																																																																																																																											13,000,000	13,000,000
Requested Future Financing Costs																																																																																																																																											7,000,000	7,000,000
Recommended Securitization Amount Per Settlement Agreement																																																																																																																																											376,000,000	376,000,000
Other Expanded Net Energy Charge Related Assets																																																																																																																																											14,000,000	14,000,000
Proposed Cost Recovery of New Environmental Investment at Northeastern Station Unit 3																																																																																																																																													210,000,000		210,000,000
Excluded AFUDC and Overheads from Proposed Cost Recovery of Northeastern Station Unit 3																																																																																																																																													46,000,000		46,000,000
Net Book Value of Northeastern Station, Units 3 and 4																																																																																																																																														232,000,000		232,000,000
Proposed Cost Recovery of New Investment at Various Gas Units																																																																																																																																													83,000,000		83,000,000
Proposed Cost Recovery of Annual Earnings Component of New Purchase Power Agreement																																																																																																																																													3,000,000		3,000,000
The Corporation Commission of the State of Oklahoma and the Oklahoma Office of the Attorney General Revised Recommended Cost Cap on Northeastern Station Unit 3 Environmental Investment																																																																																																																																													210,000,000		210,000,000
The Corporation Commission of the State of Oklahoma and the Oklahoma Office of the Attorney General Recommended Cost Cap on Northeastern Station Unit 3 Environmental Investment																																																																																																																																													175,000,000		175,000,000
Approved Base Rate Increase																																																																																																																																																													85,000,000	85,000,000
Approved Return On Equity																																																																																																																																																													10.20%	10.20%
Approved Base Rate Increase Adjustment																																																																																																																																																													92,000,000	92,000,000
Indiana Michigan Power Company Industrial Group's Recommended Recovery in a Rider																																																																																																																																																			229,000,000	229,000,000
The Indiana Office of Utility Consumer Counselor Recommended Maximum Recovery in a Rider																																																																																																																																																			408,000,000	408,000,000
The Indiana Office of Utility Consumer Counselor Recommended Maximum Recovery in Future Base Rates																																																																																																																																																			299,000,000	299,000,000
Deferred Charges and Other Noncurrent Assets	$ 1,651,000,000	$ 1,627,000,000																									$ 120,929,000	$ 115,078,000																					$ 112,871,000	$ 76,432,000													$ 250,306,000	$ 320,026,000													$ 37,158,000	$ 8,560,000							$ 117,899,000	$ 111,364,000																																																																$ 28,000,000
KIUC Recommended Percentage Cap on the One-Half Transfer of Interest in the Mitchell Plant to Kentucky Power Company																																																																																																																																																					20.00%
Current Kentucky Power Company Sharing Percentage of Off-system Sales																																																																																																																																																					40.00%
KIUC Recommended Kentucky Power Company Sharing Percentage of Off-System Sales																																																																																																																																																					0.00%