Rate Matters (Details) (USD $)																																																																																														3 Months Ended														1 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended				1 Months Ended		3 Months Ended			1 Months Ended			3 Months Ended	1 Months Ended			3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended			3 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Tanners Creek Plant, Units 1-4 [Member]	Mar. 31, 2014 Big Sandy Plant, Unit 2 [Member]	Mar. 31, 2014 Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2013 Regulatory Assets Not Yet Being Recovered [Member]	Mar. 31, 2014 Ohio Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Ohio Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Mar. 31, 2014 Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 IGCC Pre-Construction Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 IGCC Pre-Construction Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Indiana Under-Recovered Capacity Costs Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Under-Recovered Capacity Costs Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 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 [Member]	Mar. 31, 2014 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Mar. 31, 2014 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Mar. 31, 2014 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Appalachian Power Co [Member]	Dec. 31, 2013 Appalachian Power Co [Member]	Mar. 31, 2014 Appalachian Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Mar. 31, 2014 Appalachian Power Co [Member] Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Appalachian Power Co [Member] IGCC Pre-Construction Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] IGCC Pre-Construction Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 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 [Member]	Dec. 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 [Member]	Mar. 31, 2014 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 [Member]	Dec. 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 [Member]	Mar. 31, 2014 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 [Member]	Dec. 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 [Member]	Mar. 31, 2014 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Appalachian Power Co [Member] Transmission Agreement Phase-In [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 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 [Member]	Mar. 31, 2014 Appalachian Power Co [Member] Virginia Demand Response Program Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Virginia Demand Response Program Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Appalachian Power Co [Member] Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 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 [Member]	Mar. 31, 2014 Southwestern Electric Power Co [Member]	Dec. 31, 2013 Southwestern Electric Power Co [Member]	Mar. 31, 2014 Southwestern Electric Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2013 Southwestern Electric Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Mar. 31, 2014 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 [Member]	Dec. 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 [Member]	Mar. 31, 2014 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 [Member]	Dec. 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 [Member]	Mar. 31, 2014 Southwestern Electric Power Co [Member] Rate Case Expenses [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 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 [Member]	Mar. 31, 2014 Ohio Power Co [Member]	Dec. 31, 2013 Ohio Power Co [Member]	Mar. 31, 2014 Ohio Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2013 Ohio Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Mar. 31, 2014 Ohio Power Co [Member] Ohio Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Ohio Power Co [Member] Ohio Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Mar. 31, 2014 Ohio Power Co [Member] Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Ohio Power Co [Member] Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Public Service Co Of Oklahoma [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member]	Mar. 31, 2014 Public Service Co Of Oklahoma [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member] Regulatory Assets Not Yet Being Recovered [Member]	Mar. 31, 2014 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 [Member]	Dec. 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 [Member]	Mar. 31, 2014 Public Service Co Of Oklahoma [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member] Tanners Creek Plant, Units 1-4 [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member] Cook Plant Turbine [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Cook Plant Turbine [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member] Indiana Deferred Cook Plant Life Cycle Management Project Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Indiana Deferred Cook Plant Life Cycle Management Project Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member] Indiana Under-Recovered Capacity Costs Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Indiana Under-Recovered Capacity Costs Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 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 [Member]	Dec. 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 [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 Indiana Michigan Power Co [Member] Stranded Costs on Abandoned Plants [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Stranded Costs on Abandoned Plants [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Mar. 31, 2014 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member]	Mar. 31, 2014 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Mar. 31, 2014 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member]	Mar. 31, 2014 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member] Appalachian Power Co [Member]	Mar. 31, 2014 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member]	Mar. 31, 2014 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Mar. 31, 2014 Cook Plant Life Cycle Management Project [Member]	Mar. 31, 2014 Cook Plant Life Cycle Management Project [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2014 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member]	Mar. 31, 2014 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2014 Indiana 2011 Base Rate Case [Member]	Mar. 31, 2014 Indiana 2011 Base Rate Case [Member] Indiana Michigan Power Co [Member]	Mar. 31, 2014 Louisiana 2012 Formula Rate Filing [Member]	Mar. 31, 2014 Louisiana 2012 Formula Rate Filing [Member] Southwestern Electric Power Co [Member]	Apr. 25, 2014 Louisiana 2014 Formula Rate Filing [Member] Subsequent Event [Member]	Apr. 25, 2014 Louisiana 2014 Formula Rate Filing [Member] Southwestern Electric Power Co [Member] Subsequent Event [Member]	Mar. 31, 2014 Ohio Electric Security Plan Filing [Member]	Mar. 31, 2014 Ohio Electric Security Plan Filing [Member] Deferred Capacity Costs [Member]	Mar. 31, 2014 Ohio Electric Security Plan Filing [Member] Deferred Fuel Costs [Member]	Mar. 31, 2014 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member]	Mar. 31, 2014 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member] Deferred Capacity Costs [Member]	Mar. 31, 2014 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member] Deferred Fuel Costs [Member]	Mar. 31, 2014 Ohio Fuel Adjustment Clause Audit - 2009 [Member]	Mar. 31, 2014 Ohio Fuel Adjustment Clause Audit - 2009 [Member] Ohio Power Co [Member]	Mar. 31, 2014 Ohio IGCC Plant [Member]	Mar. 31, 2014 Ohio IGCC Plant [Member] Ohio Power Co [Member]	Apr. 25, 2014 Plant Transfer [Member] Subsequent Event [Member]	Apr. 25, 2014 Plant Transfer [Member] Appalachian Power Co [Member] Subsequent Event [Member]	Mar. 31, 2014 Plant Transfer [Member] Terms Of Kentucky Power Co Settlement Agreement [Member]	Mar. 31, 2014 Plant Transfer [Member] Terms Of Kentucky Power Co Settlement Agreement [Member] Big Sandy Plant, Unit 1 Natural Gas Conversion [Member]	Mar. 31, 2014 Oklahoma 2014 Base Rate Case [Member]	Apr. 25, 2014 Oklahoma 2014 Base Rate Case [Member] Subsequent Event [Member]	Apr. 25, 2014 Oklahoma 2014 Base Rate Case [Member] Subsequent Event [Member] Minimum [Member]	Apr. 25, 2014 Oklahoma 2014 Base Rate Case [Member] Subsequent Event [Member] Maximum [Member]	Mar. 31, 2014 Oklahoma 2014 Base Rate Case [Member] Public Service Co Of Oklahoma [Member]	Apr. 25, 2014 Oklahoma 2014 Base Rate Case [Member] Public Service Co Of Oklahoma [Member] Subsequent Event [Member]	Apr. 25, 2014 Oklahoma 2014 Base Rate Case [Member] Public Service Co Of Oklahoma [Member] Subsequent Event [Member] Minimum [Member]	Apr. 25, 2014 Oklahoma 2014 Base Rate Case [Member] Public Service Co Of Oklahoma [Member] Subsequent Event [Member] Maximum [Member]	Mar. 31, 2014 Ormet	Apr. 25, 2014 Ormet Subsequent Event [Member]	Mar. 31, 2014 Ormet Ohio Power Co [Member]	Apr. 25, 2014 Ormet Ohio Power Co [Member] Subsequent Event [Member]	Apr. 25, 2014 Storm Damage Recovery Rider [Member] Subsequent Event [Member]	Apr. 25, 2014 Storm Damage Recovery Rider [Member] Ohio Power Co [Member] Subsequent Event [Member]	Mar. 31, 2014 Texas 2012 Base Rate Case [Member]	Mar. 31, 2014 Texas 2012 Base Rate Case [Member] Welsh Plant, Unit 2 [Member]	Mar. 31, 2014 Texas 2012 Base Rate Case [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2014 Texas 2012 Base Rate Case [Member] Southwestern Electric Power Co [Member] Welsh Plant, Unit 2 [Member]	Mar. 31, 2014 Texas Transmission Cost Recovery Factor Filing - 2013 [Member]	Mar. 31, 2014 Texas Transmission Cost Recovery Factor Filing - 2013 [Member] Southwestern Electric Power Co [Member]	Mar. 31, 2014 Virginia 2014 Biennial Base Rate Case [Member]	Mar. 31, 2014 Virginia 2014 Biennial Base Rate Case [Member] Appalachian Power Co [Member]	Mar. 31, 2014 Virginia Transmission Rate Adjustment Clause - 2013 [Member]	Mar. 31, 2014 Virginia Transmission Rate Adjustment Clause - 2013 [Member] Appalachian Power Co [Member]
Regulatory Assets Not Being Recovered [Abstract]
Regulatory Assets, Noncurrent	$ 4,384,000,000	$ 4,376,000,000			$ 250,000,000	$ 330,000,000	$ 0	$ 14,000,000	$ 19,000,000	$ 21,000,000	$ 21,000,000	$ 0	$ 28,000,000	$ 22,000,000	$ 13,000,000	$ 13,000,000	$ 0	$ 4,000,000	$ 34,000,000	$ 37,000,000	$ 10,000,000	$ 36,000,000	$ 21,000,000	$ 22,000,000	$ 104,000,000	$ 161,000,000	$ 1,006,426,000	$ 1,003,890,000	$ 130,904,000	$ 111,218,000	$ 18,818,000	$ 20,528,000	$ 20,528,000	$ 0	$ 1,287,000	$ 1,287,000	$ 13,264,000	$ 13,264,000	$ 513,000	$ 168,000	$ 65,206,000	$ 65,206,000	$ 3,450,000	$ 3,313,000	$ 5,897,000	$ 5,012,000	$ 1,941,000	$ 2,440,000	$ 367,406,000	$ 369,905,000	$ 11,098,000	$ 11,028,000	$ 1,143,000	$ 1,143,000	$ 2,025,000	$ 1,951,000	$ 7,930,000	$ 7,934,000	$ 1,398,055,000	$ 1,378,697,000	$ 12,118,000	$ 107,074,000	$ 0	$ 13,854,000	$ 10,483,000	$ 35,631,000	$ 1,635,000	$ 57,589,000	$ 164,929,000	$ 156,690,000	$ 20,172,000	$ 19,588,000	$ 1,079,000	$ 845,000	$ 19,093,000	$ 18,743,000	$ 505,750,000	$ 524,114,000		$ 37,729,000	$ 35,386,000	$ 4,238,000	$ 3,452,000	$ 0	$ 4,093,000	$ 28,149,000	$ 21,945,000	$ 694,000	$ 164,000	$ 751,000	$ 1,836,000	$ 3,897,000	$ 3,896,000																		$ 348,000,000	$ 426,000,000		$ 348,000,000	$ 426,000,000
Rate Matters (Textuals) [Abstract]
Regulatory Assets, Noncurrent	4,384,000,000	4,376,000,000			250,000,000	330,000,000	0	14,000,000	19,000,000	21,000,000	21,000,000	0	28,000,000	22,000,000	13,000,000	13,000,000	0	4,000,000	34,000,000	37,000,000	10,000,000	36,000,000	21,000,000	22,000,000	104,000,000	161,000,000	1,006,426,000	1,003,890,000	130,904,000	111,218,000	18,818,000	20,528,000	20,528,000	0	1,287,000	1,287,000	13,264,000	13,264,000	513,000	168,000	65,206,000	65,206,000	3,450,000	3,313,000	5,897,000	5,012,000	1,941,000	2,440,000	367,406,000	369,905,000	11,098,000	11,028,000	1,143,000	1,143,000	2,025,000	1,951,000	7,930,000	7,934,000	1,398,055,000	1,378,697,000	12,118,000	107,074,000	0	13,854,000	10,483,000	35,631,000	1,635,000	57,589,000	164,929,000	156,690,000	20,172,000	19,588,000	1,079,000	845,000	19,093,000	18,743,000	505,750,000	524,114,000		37,729,000	35,386,000	4,238,000	3,452,000	0	4,093,000	28,149,000	21,945,000	694,000	164,000	751,000	1,836,000	3,897,000	3,896,000																		348,000,000	426,000,000		348,000,000	426,000,000
Potential Refund of Carrying Costs Due to an Accumulated Deferred Income Tax Credit																																																																																																														30,000,000			30,000,000
Potential Refund of Unrecognized Equity Carrying Costs Due to an Accumulated Deferred Income Tax Credit																																																																																																														16,000,000			16,000,000
Future Commitment to Support the Development of a Large Solar Farm																																																																																																														20,000,000			20,000,000
PUCO Ordered 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 2014																																																																																																														33			33
Reliability Pricing Model Rate per MW Day in Effect from June 2014 Through May 2015																																																																																																														148			148
Retail Stability Rider for the Period June 2014 through May 2015 ($ per MWh)																																																																																																														4.00			4.00
Retail Stability Rider through May 2014 ($ Per MWh)																																																																																																														3.50			3.50
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
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 November 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%
Requested Return on Equity on Capital Costs for Certain Riders																																																																																																														10.65%			10.65%
Estimated Average Decrease in Customer Rates Over Three Years																																																																																																														9.00%			9.00%
Intended Retail Stability Rider Rate To Be Continued Until Capacity Deferral Balance Is Collected																																																																																																														4.00			4.00
Recommended Amount of Storm Cost Recovery as Approved in Stipulation Agreement																																																																																																																																								55,000,000	55,000,000
Reduction in the 2012 Storm Expenses as Approved in the Stipulation Agreement																																																																																																																																								6,000,000	6,000,000
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
Net Favorable Fuel Adjustment Recorded in 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
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
Amount of Foregone Revenues to be Collected Through the Economic Development Rider as Proposed in the Stipulation Agreement																																																																																																																																				49,000,000		49,000,000
Amount of Foregone Revenues to be Collected Through the Economic Development Rider as Approved in the Economic Development Rider Filing																																																																																																																																				39,000,000		39,000,000
Remaining Ormet Deferral Allowed to be Requested Upon PUCO Adoption of Ormet Stipulation Agreement																																																																																																																																				10,000,000		10,000,000
Amount of Remaining Foregone Revenues Objected to by an Intervenor																																																																																																																																					5,000,000		5,000,000
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
Collection of Authorized Pre-Construction Costs																																																																																																																						24,000,000	24,000,000
Property, Plant and Equipment, Net			334,000,000	247,000,000																																																																											334,000,000																																																												86,000,000		86,000,000
Reversal of Previously Recorded Regulatory Disallowances																																																																																																																																										114,000,000		114,000,000
Resulting Approved Base Rate Increase																																																																																																																																										52,000,000		52,000,000
Requested Transmission Cost Recovery Factor Revenue																																																																																																																																														10,000,000	10,000,000
Louisiana Jurisdictional Share of the Turk Plant																																																																																																										29.00%	29.00%
Net 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%
Requested Annual Increase																																																																																																												5,000,000	5,000,000
Additional Requested Annual Increase																																																																																																												15,000,000	15,000,000
Requested Total Annual Increase																																																																																																												20,000,000	20,000,000
Proposed Base Rate Surcharge																																																																																																																								113,000,000	113,000,000
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 Increase In Virginia Transmission Rate Adjustment Clause Revenues																																																																																																																																																		50,000,000	50,000,000
Annual Revenue Increase as Approved in Stipulation Agreement																																																																																																																																																		49,000,000	49,000,000
Approved Return On Equity																																																																																																								10.20%	10.20%																																							10.90%	10.90%
Requested Annual Amortization of Certain Deferred Costs																																																																																																																																																7,000,000	7,000,000
Requested Base Rate Increase																																																																																																																												38,000,000				38,000,000
Requested Return on Equity																																																																																																																												10.50%				10.50%
Proposed Depreciation Increase Included in Requested Rate Increase																																																																																																																												29,000,000				29,000,000
Year One Revenues Related to Proposed Recovery of Advanced Metering Costs																																																																																																																												7,000,000				7,000,000
Year Three Revenues Related to Proposed Recovery of Advanced Metering Costs																																																																																																																												28,000,000				28,000,000
Intervenor Recommended Reduction to the Requested Increase in Annual Base Rate																																																																																																																													16,000,000				16,000,000
Intervenor Recommended Reduction in Annual Base Rates																																																																																																																													22,000,000				22,000,000
Intervenor Recommended Return on Common Equity Range																																																																																																																														9.18%	9.50%			9.18%	9.50%
Approved Base Rate Increase																																																																																																								85,000,000	85,000,000
Revised Approved Base Rate Increase																																																																																																								92,000,000	92,000,000
Projected Capital Costs																																																																																																				1,200,000,000	1,200,000,000																						60,000,000
Construction Work in Progress	2,836,000,000	2,471,000,000																									217,713,000	184,701,000																					309,200,000	281,849,000									188,636,000	185,428,000									172,949,000	175,890,000							476,734,000	427,164,000																						405,000,000	405,000,000
Amount Excluded from Indiana Utility Regulatory Commission LCM Project Approval																																																																																																						23,000,000	23,000,000
Annual Amount of Asset Transfer Rider																																																																																																																										44,000,000
Annual Level of Off System Sales Margins in Base Rates Above Which is Proposed to be Retained by Kentucky Power Company																																																																																																																										15,300,000
Asset Impairments and Other Related Charges																																																																																																																										$ 33,000,000