Rate Matters (Details) (USD $)	3 Months Ended		6 Months Ended																																																																				3 Months Ended		6 Months Ended																													6 Months Ended																	1 Months Ended			6 Months Ended	1 Months Ended			6 Months Ended																		6 Months Ended		6 Months Ended		6 Months Ended	1 Months Ended		6 Months Ended	1 Months Ended		6 Months Ended							6 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Big Sandy Plant, Unit 2 [Member]	Jun. 30, 2014 Tanners Creek Plant, Units 1-4 [Member]	Jun. 30, 2014 Regulatory Assets Pending Final Regulatory Approval [Member]	Dec. 31, 2013 Regulatory Assets Pending Final Regulatory Approval [Member]	Jun. 30, 2014 Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 IGCC Pre-Construction Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 IGCC Pre-Construction Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Indiana Under-Recovered Capacity Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Under-Recovered Capacity Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Ohio Economic Development Rider [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Ohio Economic Development Rider [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Jun. 30, 2014 Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Jun. 30, 2014 Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Jun. 30, 2014 Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 West Virginia Vegetation Management Program [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 West Virginia Vegetation Management Program [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member]	Dec. 31, 2013 Appalachian Power Co [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Pending Final Regulatory Approval [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 Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] IGCC Pre-Construction Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] IGCC Pre-Construction Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Pending Final Regulatory Approval [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 Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Regulatory Assets Pending Final Regulatory Approval [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 Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Transmission Agreement Phase-In [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Transmission Agreement Phase-In [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Virginia Demand Response Program Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Virginia Demand Response Program Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Appalachian Power Co [Member] Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Appalachian Power Co [Member] Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Tanners Creek Plant, Units 1-4 [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Cook Plant Turbine [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Cook Plant Turbine [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Indiana Deferred Cook Plant Life Cycle Management Project Costs [Member] Regulatory Assets Pending Final Regulatory Approval [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 Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Indiana Under-Recovered Capacity Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Indiana Under-Recovered Capacity Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Indiana Michigan Power Co [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Indiana Michigan Power Co [Member] Stranded Costs on Abandoned Plants [Member] Regulatory Assets Pending Final Regulatory Approval [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 Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Ohio Power Co [Member]	Jun. 30, 2013 Ohio Power Co [Member]	Jun. 30, 2014 Ohio Power Co [Member]	Jun. 30, 2013 Ohio Power Co [Member]	Dec. 31, 2013 Ohio Power Co [Member]	Jun. 30, 2014 Ohio Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Dec. 31, 2013 Ohio Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Jun. 30, 2014 Ohio Power Co [Member] Ohio Economic Development Rider [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2013 Ohio Power Co [Member] Ohio Economic Development Rider [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Earning a Return [Member]	Jun. 30, 2014 Ohio Power Co [Member] Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Ohio Power Co [Member] Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Public Service Co Of Oklahoma [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member]	Jun. 30, 2014 Public Service Co Of Oklahoma [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Jun. 30, 2014 Public Service Co Of Oklahoma [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Public Service Co Of Oklahoma [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Public Service Co Of Oklahoma [Member] Storm Costs [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Southwestern Electric Power Co [Member]	Dec. 31, 2013 Southwestern Electric Power Co [Member]	Jun. 30, 2014 Southwestern Electric Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Dec. 31, 2013 Southwestern Electric Power Co [Member] Regulatory Assets Pending Final Regulatory Approval [Member]	Jun. 30, 2014 Southwestern Electric Power Co [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Regulatory Assets Pending Final Regulatory Approval [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 Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Southwestern Electric Power Co [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Southwestern Electric Power Co [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 Southwestern Electric Power Co [Member] Rate Case Expenses [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2013 Southwestern Electric Power Co [Member] Rate Case Expenses [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Currently Not Earning a Return [Member]	Jun. 30, 2014 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member]	Jun. 30, 2014 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Jun. 30, 2014 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member]	Jun. 30, 2014 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member] Appalachian Power Co [Member]	Jun. 30, 2014 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member]	Jun. 30, 2014 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Jun. 30, 2014 Cook Plant Life Cycle Management Project [Member]	Jun. 30, 2014 Cook Plant Life Cycle Management Project [Member] Indiana Michigan Power Co [Member]	Jun. 30, 2014 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member]	Jun. 30, 2014 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member] Indiana Michigan Power Co [Member]	Jun. 30, 2014 Indiana Base Rate Case - 2011 [Member]	Jun. 30, 2014 Indiana Base Rate Case - 2011 [Member] Indiana Michigan Power Co [Member]	Jun. 30, 2014 Louisiana 2012 Formula Rate Filing [Member]	Jun. 30, 2014 Louisiana 2012 Formula Rate Filing [Member] Southwestern Electric Power Co [Member]	Jun. 30, 2014 Louisiana 2014 Formula Rate Filing [Member]	Jun. 30, 2014 Louisiana 2014 Formula Rate Filing [Member] Southwestern Electric Power Co [Member]	Jun. 30, 2014 Ohio Electric Security Plan Filings [Member]	Jul. 25, 2014 Ohio Electric Security Plan Filings [Member] Subsequent Event [Member]	Jun. 30, 2014 Ohio Electric Security Plan Filings [Member] Deferred Capacity Costs [Member]	Jun. 30, 2014 Ohio Electric Security Plan Filings [Member] Deferred Fuel Costs [Member]	Jun. 30, 2014 Ohio Electric Security Plan Filings [Member] Ohio Power Co [Member]	Jul. 25, 2014 Ohio Electric Security Plan Filings [Member] Ohio Power Co [Member] Subsequent Event [Member]	Jun. 30, 2014 Ohio Electric Security Plan Filings [Member] Ohio Power Co [Member] Deferred Capacity Costs [Member]	Jun. 30, 2014 Ohio Electric Security Plan Filings [Member] Ohio Power Co [Member] Deferred Fuel Costs [Member]	Jun. 30, 2014 Ohio Fuel Adjustment Clause Audit - 2009 [Member]	Jun. 30, 2014 Ohio Fuel Adjustment Clause Audit - 2009 [Member] Ohio Power Co [Member]	Jun. 30, 2014 Ohio IGCC Plant [Member]	Jun. 30, 2014 Ohio IGCC Plant [Member] Ohio Power Co [Member]	Jun. 30, 2014 Oklahoma Base Rate Case - 2014 [Member]	Jun. 30, 2014 Oklahoma Base Rate Case - 2014 [Member] Minimum [Member]	Jun. 30, 2014 Oklahoma Base Rate Case - 2014 [Member] Maximum [Member]	Jun. 30, 2014 Oklahoma Base Rate Case - 2014 [Member] Public Service Co Of Oklahoma [Member]	Jun. 30, 2014 Oklahoma Base Rate Case - 2014 [Member] Public Service Co Of Oklahoma [Member] Minimum [Member]	Jun. 30, 2014 Oklahoma Base Rate Case - 2014 [Member] Public Service Co Of Oklahoma [Member] Maximum [Member]	Jun. 30, 2014 Plant Transfer [Member]	Jun. 30, 2014 Plant Transfer [Member] Appalachian Power Co [Member]	Jun. 30, 2014 Plant Transfer [Member] Terms Of Kentucky Power Co Memorandum Of Understanding [Member]	Jun. 30, 2014 Plant Transfer [Member] Terms Of Kentucky Power Co Memorandum Of Understanding [Member] Big Sandy Plant, Unit 1 Natural Gas Conversion [Member]	Jun. 30, 2014 Special Rate Mechanism For Ormet [Member]	Jun. 30, 2014 Special Rate Mechanism For Ormet [Member] Ohio Power Co [Member]	Jun. 30, 2014 Storm Damage Recovery Rider [Member] Storm Costs [Member]	Jun. 30, 2014 Storm Damage Recovery Rider [Member] Ohio Power Co [Member] Storm Costs [Member]	Jun. 30, 2014 Texas Base Rate Case - 2012 [Member]	Jun. 30, 2014 Texas Base Rate Case - 2012 [Member] Welsh Plant, Unit 2 [Member]	Jun. 30, 2014 Texas Base Rate Case - 2012 [Member] Southwestern Electric Power Co [Member]	Jun. 30, 2014 Texas Base Rate Case - 2012 [Member] Southwestern Electric Power Co [Member] Welsh Plant, Unit 2 [Member]	Jun. 30, 2014 Texas Transmission Cost Recovery Factor Filing [Member]	Jul. 25, 2014 Texas Transmission Cost Recovery Factor Filing [Member] Subsequent Event [Member] Minimum [Member]	Jul. 25, 2014 Texas Transmission Cost Recovery Factor Filing [Member] Subsequent Event [Member] Maximum [Member]	Jun. 30, 2014 Texas Transmission Cost Recovery Factor Filing [Member] Southwestern Electric Power Co [Member]	Jul. 25, 2014 Texas Transmission Cost Recovery Factor Filing [Member] Southwestern Electric Power Co [Member] Subsequent Event [Member] Minimum [Member]	Jul. 25, 2014 Texas Transmission Cost Recovery Factor Filing [Member] Southwestern Electric Power Co [Member] Subsequent Event [Member] Maximum [Member]	Jun. 30, 2014 Virginia Biennial Base Rate Case - 2014 [Member]	Jun. 30, 2014 Virginia Biennial Base Rate Case - 2014 [Member] Appalachian Power Co [Member]	Jun. 30, 2014 Virginia Transmission Rate Adjustment Clause - 2014 [Member]	Jun. 30, 2014 Virginia Transmission Rate Adjustment Clause - 2014 [Member] Appalachian Power Co [Member]	Jun. 30, 2014 Welsh Plant, Units 1 and 3 - Environmental Projects [Member]	Jun. 30, 2014 Welsh Plant, Units 1 and 3 - Environmental Projects [Member] Mercury and Air Toxic Standards [Member]	Jun. 30, 2014 Welsh Plant, Units 1 and 3 - Environmental Projects [Member] Welsh Plant, Units 1 and 3 [Member]	Jun. 30, 2014 Welsh Plant, Units 1 and 3 - Environmental Projects [Member] Southwestern Electric Power Co [Member]	Jun. 30, 2014 Welsh Plant, Units 1 and 3 - Environmental Projects [Member] Southwestern Electric Power Co [Member] Mercury and Air Toxic Standards [Member]	Jun. 30, 2014 Welsh Plant, Units 1 and 3 - Environmental Projects [Member] Southwestern Electric Power Co [Member] Welsh Plant, Units 1 and 3 [Member]	Jun. 30, 2014 West Virginia Base Rate Case [Member]	Jun. 30, 2014 West Virginia Base Rate Case [Member] Appalachian Power Co [Member]
Regulatory Assets Not Being Recovered [Abstract]
Regulatory Assets, Noncurrent	$ 4,390,000,000		$ 4,390,000,000		$ 4,376,000,000			$ 219,000,000	$ 330,000,000	$ 14,000,000	$ 21,000,000	$ 21,000,000	$ 0	$ 0	$ 22,000,000	$ 13,000,000	$ 13,000,000	$ 0	$ 14,000,000	$ 10,000,000	$ 36,000,000	$ 7,000,000	$ 4,000,000	$ 34,000,000	$ 37,000,000	$ 21,000,000	$ 22,000,000	$ 99,000,000	$ 161,000,000	$ 6,458,000	$ 0	$ 1,006,282,000	$ 1,003,890,000	$ 130,246,000	$ 111,218,000	$ 13,686,000	$ 20,528,000	$ 20,528,000	$ 0	$ 1,287,000	$ 1,287,000	$ 13,264,000	$ 13,264,000	$ 1,109,000	$ 168,000	$ 65,206,000	$ 65,206,000	$ 0	$ 3,313,000	$ 6,767,000	$ 5,012,000	$ 1,941,000	$ 2,440,000	$ 506,770,000	$ 524,114,000		$ 10,470,000	$ 35,386,000	$ 5,024,000	$ 3,452,000	$ 0	$ 4,093,000	$ 0	$ 21,945,000	$ 1,549,000	$ 164,000	$ 0	$ 1,836,000	$ 3,897,000	$ 3,896,000	$ 1,412,717,000		$ 1,412,717,000		$ 1,378,697,000	$ 10,869,000	$ 107,074,000	$ 0	$ 13,854,000	$ 10,483,000	$ 35,631,000	$ 386,000	$ 57,589,000	$ 162,026,000	$ 156,690,000	$ 16,668,000	$ 19,588,000	$ 1,079,000	$ 845,000	$ 15,589,000	$ 18,743,000	$ 365,527,000	$ 369,905,000	$ 11,233,000	$ 11,028,000	$ 1,143,000	$ 1,143,000	$ 2,101,000	$ 1,951,000	$ 7,989,000	$ 7,934,000																			$ 396,000,000	$ 411,000,000			$ 396,000,000	$ 411,000,000
Rate Matters (Textuals) [Abstract]
Regulatory Assets, Noncurrent	4,390,000,000		4,390,000,000		4,376,000,000			219,000,000	330,000,000	14,000,000	21,000,000	21,000,000	0	0	22,000,000	13,000,000	13,000,000	0	14,000,000	10,000,000	36,000,000	7,000,000	4,000,000	34,000,000	37,000,000	21,000,000	22,000,000	99,000,000	161,000,000	6,458,000	0	1,006,282,000	1,003,890,000	130,246,000	111,218,000	13,686,000	20,528,000	20,528,000	0	1,287,000	1,287,000	13,264,000	13,264,000	1,109,000	168,000	65,206,000	65,206,000	0	3,313,000	6,767,000	5,012,000	1,941,000	2,440,000	506,770,000	524,114,000		10,470,000	35,386,000	5,024,000	3,452,000	0	4,093,000	0	21,945,000	1,549,000	164,000	0	1,836,000	3,897,000	3,896,000	1,412,717,000		1,412,717,000		1,378,697,000	10,869,000	107,074,000	0	13,854,000	10,483,000	35,631,000	386,000	57,589,000	162,026,000	156,690,000	16,668,000	19,588,000	1,079,000	845,000	15,589,000	18,743,000	365,527,000	369,905,000	11,233,000	11,028,000	1,143,000	1,143,000	2,101,000	1,951,000	7,989,000	7,934,000																			396,000,000	411,000,000			396,000,000	411,000,000
Potential Refund of Carrying Costs Due to an Accumulated Deferred Income Tax Credit																																																																																																																						29,000,000				29,000,000
Potential Refund of Unrecognized Equity Carrying Costs Due to an Accumulated Deferred Income Tax Credit																																																																																																																						15,000,000				15,000,000
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																																																																																																																						34				34
Reliability Pricing Model Rate per MW Day in Effect from June 2014 Through May 2015																																																																																																																						150				150
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 ($ 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 Conducted an Energy Only Auction for Delivery Beginning November 2014 through May 2015																																																																																																																						25.00%				25.00%
Additional Percentage of Standard Service Offer Load Which Registrant Will Conduct an Energy Only Auction for Delivery Beginning November 2014 through May 2015																																																																																																																						25.00%				25.00%
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 ($ per MWh)																																																																																																																							4.00				4.00
Future Commitment to Support the Development of a Large Solar Farm																																																																																																																						20,000,000				20,000,000
Recommended Amount of Storm Cost Recovery as Approved in Stipulation Agreement																																																																																																																																														55,000,000	55,000,000
2008 Coal Contract Settlement Proceeds to be Applied to Deferred Fuel Adjustment Clause as Originally 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						276,000,000	327,000,000																																																	327,000,000																																																																																									85,000,000		85,000,000													297,000,000			297,000,000
2013 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																																																																																																																																																				15,000,000			15,000,000
Intervenor Recommended Decrease To Annual Revenue																																																																																																																																																					5,000,000	14,000,000		5,000,000	14,000,000
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 RAC 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									89,000,000	77,000,000
Requested Base Rate Increase																																																																																																																																		38,000,000			38,000,000																															181,000,000	156,000,000
Requested Return on Equity																																																																																																																																		10.50%			10.50%																															10.62%	10.62%
Requested Annual Vegetation Management Rider																																																																																																																																																																				45,000,000	38,000,000
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%
Revised Requested Base Rate Increase																																																																																																																																		42,000,000			42,000,000
Return on Common Equity for AFUDC and Factoring as Proposed in Stipulation Agreement																																																																																																																																		9.85%			9.85%
2014 Revenues Related to Advanced Metering Costs as Proposed in Stipulation Agreement																																																																																																																																		7,000,000			7,000,000
2016 Revenues Related to Advanced Metering Costs as Proposed in Stipulation Agreement																																																																																																																																		27,000,000			27,000,000
Approved Base Rate Increase																																																																																																																85,000,000	85,000,000
Revised Approved Base Rate Increase																																																																																																																92,000,000	92,000,000
Amount of Prepaid Pension Asset in Rate Base Opposed by Intervenor on Appeal																																																																																																																7,000,000	7,000,000
Projected Capital Costs																																																																																																												1,200,000,000	1,200,000,000																														60,000,000																			600,000,000	410,000,000		600,000,000	410,000,000
Construction Work in Progress	2,886,000,000		2,886,000,000		2,471,000,000																											222,129,000	184,701,000																					518,635,000	427,164,000																200,658,000		200,658,000		185,428,000									129,655,000	175,890,000							342,719,000	281,849,000															439,000,000	439,000,000																																																	72,000,000			72,000,000
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	$ 0	$ 154,000,000	$ 0	$ 154,000,000																																																																			$ 0	$ 154,304,000	$ 0	$ 154,304,000