Rate Matters (Details) (USD $)	3 Months Ended		9 Months Ended																																																			3 Months Ended		9 Months Ended											3 Months Ended		9 Months Ended																																				9 Months Ended			9 Months Ended			1 Months Ended				9 Months Ended										9 Months Ended		9 Months Ended	1 Months Ended	9 Months Ended		9 Months Ended	1 Months Ended	9 Months Ended		9 Months Ended																9 Months Ended								1 Months Ended	9 Months Ended									9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Tanners Creek Plant, Units 1-4 [Member]	Sep. 30, 2013 Big Sandy Plant, Unit 2 [Member]	Sep. 30, 2013 Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2012 Regulatory Assets Not Yet Being Recovered [Member]	Sep. 30, 2013 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2012 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Sep. 30, 2013 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 2013 Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Virginia Environmental Rate Adjustment Clause [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 2013 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2012 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Sep. 30, 2013 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, 2012 Other Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 2013 Litigation Settlement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Litigation Settlement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 2013 Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2012 Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Sep. 30, 2013 Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Ormet Special Rate Recovery Mechanism [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 2013 Under-Recovered Capacity Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Under-Recovered Capacity Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 2013 Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Expanded Net Energy Charge - Coal Inventory [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 2013 Appalachian Power Co [Member]	Dec. 31, 2012 Appalachian Power Co [Member]	Sep. 30, 2013 Appalachian Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2012 Appalachian Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Sep. 30, 2013 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Appalachian Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 2013 Appalachian Power Co [Member] Deferred Wind Power Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	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 [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 2013 Appalachian Power Co [Member] Dresden Plant Operating Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	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 [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 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]	Dec. 31, 2012 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]	Sep. 30, 2013 Southwestern Electric Power Co [Member]	Sep. 30, 2012 Southwestern Electric Power Co [Member]	Sep. 30, 2013 Southwestern Electric Power Co [Member]	Sep. 30, 2012 Southwestern Electric Power Co [Member]	Dec. 31, 2012 Southwestern Electric Power Co [Member]	Sep. 30, 2013 Southwestern Electric Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2012 Southwestern Electric Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 2013 Ohio Power Co [Member]	Sep. 30, 2012 Ohio Power Co [Member]	Sep. 30, 2013 Ohio Power Co [Member]	Sep. 30, 2012 Ohio Power Co [Member]	Dec. 31, 2012 Ohio Power Co [Member]	Sep. 30, 2013 Ohio Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2012 Ohio Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Sep. 30, 2013 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Dec. 31, 2012 Ohio Power Co [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 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 [Member]	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 [Member]	Sep. 30, 2013 Ohio Power Co [Member] Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Dec. 31, 2012 Ohio Power Co [Member] Economic Development Rider [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Earning a Return [Member]	Sep. 30, 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]	Dec. 31, 2012 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]	Sep. 30, 2013 Public Service Co Of Oklahoma [Member]	Dec. 31, 2012 Public Service Co Of Oklahoma [Member]	Sep. 30, 2013 Public Service Co Of Oklahoma [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2012 Public Service Co Of Oklahoma [Member] Regulatory Assets Not Yet Being Recovered [Member]	Sep. 30, 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]	Dec. 31, 2012 Public Service Co Of Oklahoma [Member] Storm Costs [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member]	Dec. 31, 2012 Indiana Michigan Power Co [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member] Tanners Creek Plant, Units 1-4 [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Dec. 31, 2012 Indiana Michigan Power Co [Member] Regulatory Assets Not Yet Being Recovered [Member]	Sep. 30, 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]	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 [Member]	Sep. 30, 2013 Indiana Michigan Power Co [Member] Litigation Settlement [Member] Regulatory Assets Not Yet Being Recovered [Member] Regulatory Assets Currently Not Earning a Return [Member]	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 [Member]	Sep. 30, 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 [Member]	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 [Member]	Sep. 30, 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 [Member]	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 [Member]	Sep. 30, 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]	Dec. 31, 2012 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]	Sep. 30, 2013 Ohio Electric Security Plan Filing [Member]	Sep. 30, 2013 Ohio Electric Security Plan Filing [Member] Deferred Capacity Costs [Member]	Sep. 30, 2013 Ohio Electric Security Plan Filing [Member] Deferred Fuel Costs [Member]	Sep. 30, 2013 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member]	Sep. 30, 2013 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member] Deferred Capacity Costs [Member]	Sep. 30, 2013 Ohio Electric Security Plan Filing [Member] Ohio Power Co [Member] Deferred Fuel Costs [Member]	Oct. 25, 2013 Ohio Electric Security Plan Filing [Member] Significantly Excessive Earnings Test - 2010 [Member] Subsequent Event [Member]	Oct. 25, 2013 Ohio Electric Security Plan Filing [Member] Significantly Excessive Earnings Test - 2010 [Member] Ohio Power Co [Member] Subsequent Event [Member]	Sep. 30, 2013 Storm Damage Recovery Rider [Member] Storm Costs [Member]	Sep. 30, 2013 Storm Damage Recovery Rider [Member] Ohio Power Co [Member] Storm Costs [Member]	Sep. 30, 2013 Ohio Fuel Adjustment Clause Audit - 2009 [Member]	Sep. 30, 2013 Ohio Fuel Adjustment Clause Audit - 2009 [Member] Ohio Power Co [Member]	Sep. 30, 2013 Ormet Interim Arrangement [Member]	Sep. 30, 2013 Ormet Interim Arrangement [Member] Ohio Power Co [Member]	Sep. 30, 2013 Special Rate Mechanism For Ormet [Member]	Sep. 30, 2013 Special Rate Mechanism For Ormet [Member] Ohio Power Co [Member]	Sep. 30, 2013 Ohio IGCC Plant [Member]	Sep. 30, 2013 Ohio IGCC Plant [Member] Ohio Power Co [Member]	Sep. 30, 2013 Turk Plant [Member]	Sep. 30, 2013 Turk Plant [Member] Electric Transmission [Member]	Sep. 30, 2013 Turk Plant [Member] Southwestern Electric Power Co [Member]	Sep. 30, 2013 Turk Plant [Member] Southwestern Electric Power Co [Member] Electric Transmission [Member]	Sep. 30, 2013 Texas Base Rate Case [Member]	Oct. 25, 2013 Texas Base Rate Case [Member] Subsequent Event [Member]	Sep. 30, 2013 Texas Base Rate Case [Member] Subsequent Event [Member]	Sep. 30, 2013 Texas Base Rate Case [Member] Welsh Plant, Unit 2 [Member]	Sep. 30, 2013 Texas Base Rate Case [Member] Southwestern Electric Power Co [Member]	Oct. 25, 2013 Texas Base Rate Case [Member] Southwestern Electric Power Co [Member] Subsequent Event [Member]	Sep. 30, 2013 Texas Base Rate Case [Member] Southwestern Electric Power Co [Member] Subsequent Event [Member]	Sep. 30, 2013 Texas Base Rate Case [Member] Southwestern Electric Power Co [Member] Welsh Plant, Unit 2 [Member]	Sep. 30, 2013 Louisiana 2012 Formula Rate Filing [Member]	Sep. 30, 2013 Louisiana 2012 Formula Rate Filing [Member] Southwestern Electric Power Co [Member]	Sep. 30, 2013 Flint Creek Plant Environmental Controls [Member]	Sep. 30, 2013 Flint Creek Plant Environmental Controls [Member] Southwestern Electric Power Co [Member]	Sep. 30, 2013 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member]	Sep. 30, 2013 APCo's Filing for IGCC Plant [Member] Applicable to West Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Sep. 30, 2013 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member]	Sep. 30, 2013 APCo's Filing for IGCC Plant [Member] Applicable to FERC Jurisdiction [Member] Appalachian Power Co [Member]	Sep. 30, 2013 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member]	Sep. 30, 2013 APCo's Filing for IGCC Plant [Member] Applicable to Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Sep. 30, 2013 West Virginia Expanded Net Energy Charge [Member]	Sep. 30, 2013 West Virginia Expanded Net Energy Charge [Member] Appalachian Power Co [Member]	Sep. 30, 2013 Oklahoma Environmental Compliance Plan [Member] Northeastern Station, Unit 3 [Member]	Sep. 30, 2013 Oklahoma Environmental Compliance Plan [Member] Northeastern Station, Unit 4 [Member]	Sep. 30, 2013 Oklahoma Environmental Compliance Plan [Member] Public Service Co Of Oklahoma [Member] Northeastern Station, Unit 3 [Member]	Sep. 30, 2013 Oklahoma Environmental Compliance Plan [Member] Public Service Co Of Oklahoma [Member] Northeastern Station, Unit 4 [Member]	Sep. 30, 2013 Cook Plant Life Cycle Management Project [Member]	Sep. 30, 2013 Cook Plant Life Cycle Management Project [Member] Indiana Michigan Power Co [Member]	Sep. 30, 2013 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member]	Sep. 30, 2013 Cook Plant Life Cycle Management Project [Member] Indiana Filing [Member] Indiana Michigan Power Co [Member]	Sep. 30, 2013 Plant Transfer [Member]	Sep. 30, 2013 Plant Transfer [Member] Appalachian Power Co [Member]	Sep. 30, 2013 Plant Transfer [Member] Applicable to Virginia Jurisdiction [Member]	Sep. 30, 2013 Plant Transfer [Member] Applicable to Virginia Jurisdiction [Member] Appalachian Power Co [Member]	Oct. 25, 2013 Plant Transfer [Member] Terms Of Kentucky Power Co Settlement Agreement [Member] Subsequent Event [Member]	Sep. 30, 2013 Plant Transfer [Member] Terms Of Kentucky Power Co Settlement Agreement [Member] Subsequent Event [Member]	Sep. 30, 2013 Plant Transfer [Member] Applicable to West Virginia and FERC Jurisdictions [Member]	Sep. 30, 2013 Plant Transfer [Member] Applicable to West Virginia and FERC Jurisdictions [Member] Appalachian Power Co [Member]	Sep. 30, 2013 Virginia Environmental Rate Adjustment Clause [Member]	Sep. 30, 2013 Virginia Environmental Rate Adjustment Clause [Member] Appalachian Power Co [Member]	Sep. 30, 2013 Virginia Generation Rate Adjustment Clause [Member] Dresden Plant [Member]	Sep. 30, 2013 Virginia Generation Rate Adjustment Clause [Member] Appalachian Power Co [Member] Dresden Plant [Member]	Sep. 30, 2013 Rockport Plant Clean Coal Technology Project [Member]	Sep. 30, 2013 Rockport Plant Clean Coal Technology Project [Member] Indiana Michigan Power Co [Member]	Sep. 30, 2013 Rockport Plant Clean Coal Technology Project [Member] Indiana Filing [Member]	Sep. 30, 2013 Rockport Plant Clean Coal Technology Project [Member] Indiana Filing [Member] Indiana Michigan Power Co [Member]	Sep. 30, 2013 Indiana Base Rate Case [Member]	Sep. 30, 2013 Indiana Base Rate Case [Member] Indiana Michigan Power Co [Member]	Sep. 30, 2013 Virginia Storm Costs [Member]	Sep. 30, 2013 Virginia Storm Costs [Member] Appalachian Power Co [Member]	Sep. 30, 2013 Kentucky 2013 Base Rate Case [Member]
Regulatory Assets Not Being Recovered [Abstract]
Regulatory Assets, Noncurrent	$ 5,038,000,000		$ 5,038,000,000		$ 5,106,000,000			$ 341,000,000	$ 304,000,000	$ 22,000,000	$ 23,000,000	$ 153,000,000	$ 172,000,000	$ 14,000,000	$ 14,000,000	$ 28,000,000	$ 29,000,000	$ 3,000,000	$ 1,000,000	$ 38,000,000	$ 36,000,000	$ 0	$ 11,000,000	$ 14,000,000	$ 13,000,000	$ 32,000,000	$ 5,000,000	$ 16,000,000	$ 0	$ 21,000,000	$ 0	$ 1,339,713,000	$ 1,435,704,000	$ 145,510,000	$ 157,560,000	$ 65,206,000	$ 94,458,000	$ 14,155,000	$ 14,155,000	$ 28,417,000	$ 29,320,000	$ 0	$ 5,143,000	$ 4,246,000	$ 1,447,000	$ 8,358,000	$ 8,758,000	$ 3,313,000	$ 2,992,000	$ 1,287,000	$ 1,287,000	$ 20,528,000	$ 0	$ 375,581,000		$ 375,581,000		$ 403,278,000	$ 11,267,000	$ 9,000,000	$ 2,585,000	$ 2,188,000	$ 1,143,000	$ 2,295,000	$ 7,539,000	$ 4,517,000	$ 1,455,176,000		$ 1,455,176,000		$ 1,420,966,000	$ 111,383,000	$ 80,524,000	$ 62,677,000	$ 61,828,000	$ 2,669,000	$ 30,000	$ 13,693,000	$ 13,213,000	$ 32,344,000	$ 5,453,000	$ 185,856,000	$ 202,328,000	$ 7,790,000	$ 423,000	$ 6,968,000	$ 0	$ 822,000	$ 423,000	$ 567,402,000	$ 540,019,000		$ 22,959,000	$ 13,264,000	$ 3,316,000	$ 786,000	$ 0	$ 11,098,000	$ 0	$ 1,380,000	$ 16,445,000	$ 0	$ 3,198,000	$ 0		$ 228,000,000	$ 467,000,000		$ 228,000,000	$ 467,000,000			$ 61,000,000	$ 61,000,000					$ 32,000,000	$ 32,000,000																									$ 281,000,000	$ 281,000,000																	$ 28,000,000	$ 28,000,000	$ 6,000,000	$ 6,000,000
Rate Matters (Textuals) [Abstract]
Regulatory Assets, Noncurrent	5,038,000,000		5,038,000,000		5,106,000,000			341,000,000	304,000,000	22,000,000	23,000,000	153,000,000	172,000,000	14,000,000	14,000,000	28,000,000	29,000,000	3,000,000	1,000,000	38,000,000	36,000,000	0	11,000,000	14,000,000	13,000,000	32,000,000	5,000,000	16,000,000	0	21,000,000	0	1,339,713,000	1,435,704,000	145,510,000	157,560,000	65,206,000	94,458,000	14,155,000	14,155,000	28,417,000	29,320,000	0	5,143,000	4,246,000	1,447,000	8,358,000	8,758,000	3,313,000	2,992,000	1,287,000	1,287,000	20,528,000	0	375,581,000		375,581,000		403,278,000	11,267,000	9,000,000	2,585,000	2,188,000	1,143,000	2,295,000	7,539,000	4,517,000	1,455,176,000		1,455,176,000		1,420,966,000	111,383,000	80,524,000	62,677,000	61,828,000	2,669,000	30,000	13,693,000	13,213,000	32,344,000	5,453,000	185,856,000	202,328,000	7,790,000	423,000	6,968,000	0	822,000	423,000	567,402,000	540,019,000		22,959,000	13,264,000	3,316,000	786,000	0	11,098,000	0	1,380,000	16,445,000	0	3,198,000	0		228,000,000	467,000,000		228,000,000	467,000,000			61,000,000	61,000,000					32,000,000	32,000,000																									281,000,000	281,000,000																	28,000,000	28,000,000	6,000,000	6,000,000
Unrecognized Equity Carrying Costs																																																																																																																																																	2,000,000	2,000,000																	10,000,000	10,000,000	4,000,000	4,000,000
Future Commitment to Support the Development of a Large Solar Farm																																																																																																									20,000,000			20,000,000
PUCO Ordered Refund of Pretax Earnings to Customers																																																																																																															7,000,000	7,000,000
Potential Refund of Carrying Costs Due to an Accumulated Deferred Income Tax Credit																																																																																																									33,000,000			33,000,000
Potential Refund of Unrecognized Equity Carrying Costs Due to an Accumulated Deferred Income Tax Credit																																																																																																									17,000,000			17,000,000
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 2014																																																																																																									33			33
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
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
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
Subsidiary's Ownership Percentage																																																																																																																											73.00%		73.00%
Asset Impairments and Other Related Charges	144,000,000	13,000,000	298,000,000	13,000,000																																																		110,850,000	0	110,850,000	13,000,000										0	0	154,304,000	0																																																					173,000,000		173,000,000				111,000,000				111,000,000																											33,000,000
Property, Plant and Equipment	26,172,000,000		26,172,000,000		26,279,000,000																											5,688,679,000	5,632,665,000																					3,813,995,000		3,813,995,000		3,888,230,000									8,392,967,000		8,392,967,000		8,673,296,000											1,381,290,000	1,346,530,000							4,177,462,000	4,062,733,000																																1,600,000,000	118,000,000	1,600,000,000	118,000,000
Incurred Construction Expenditures Before Regulatory Provision																																																																																																																											1,800,000,000		1,800,000,000
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 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																																												114,000,000
Requested Return on Equity																																																																																																																															11.25%				11.25%																																												10.65%
Texas Jurisdictional Share of the Turk Plant																																																																																																																															33.00%				33.00%
Approved Base Rate Increase																																																																																																																																39,000,000				39,000,000																																							85,000,000	85,000,000
Approved Return On Equity																																																																																																																																9.65%				9.65%																																							10.20%	10.20%
Property, Plant and Equipment, Net						342,000,000	251,000,000																																																																																					342,000,000																																						94,000,000				94,000,000													182,000,000	101,000,000	182,000,000	101,000,000
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%
Projected Capital Costs																																																																																																																																									408,000,000	408,000,000													1,200,000,000	1,200,000,000															285,000,000
Subsidiary's Portion of Projected Capital Costs																																																																																																																																									204,000,000	204,000,000
Commission Ordered Reduction in the Proposed Asset Transfer Price																																																																																																																																																											83,000,000	83,000,000	39,000,000	39,000,000			44,000,000	44,000,000
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
Recommended Recovery of 2011 and 2012 Environmental Compliance Costs Per Settlement Agreement																																																																																																																																																																			38,000,000	38,000,000
Requested Increase in Virginia Generation RAC Revenues Related to the Dresden Plant																																																																																																																																																																					12,000,000	12,000,000
Requested Total Collection of Costs Related to the Dresden Plant																																																																																																																																																																					38,000,000	38,000,000
Increase in Generation RAC Per Settlement Agreement if Proposed Merger Occurs by January 2014																																																																																																																																																																					37,000,000	37,000,000
Increase in Generation RAC Per Settlement Agreement if Proposed Merger Does Not Occur by January 2014																																																																																																																																																																					39,000,000	39,000,000
Component to Collect Under-Recovery																																																																																																																																																																					9,000,000	9,000,000
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
Approved Securitization Amount Per Settlement Agreement																																																																																																																																																	376,000,000	376,000,000
Reduction in Annual ENEC Revenues Per Approved Settlement Agreement																																																																																																																																																	56,000,000	56,000,000
Increase in Annual Construction Surcharge Per Approved Settlement Agreement																																																																																																																																																	6,000,000	6,000,000
Amount of Deferral from the ENEC Recovery Balance Until Reaching Certain Coal Inventory Levels																																																																																																																																																	21,000,000	21,000,000
Other Expanded Net Energy Charge Related Assets																																																																																																																																																	14,000,000	14,000,000
Write-off of Regulatory Asset, Pretax																																																																																																																																																																													30,000,000	30,000,000
Approved Base Rate Increase Adjustment																																																																																																																																																																											92,000,000	92,000,000
Amount Excluded from Indiana Utility Regulatory Commission LCM Project Approval																																																																																																																																																									23,000,000	23,000,000
Revised Projected Capital Costs per Settlement Agreement																																																																																																																																																																									258,000,000	129,000,000
Federal Mandate Percentage of Project to be Recovered Under a Rider per Settlement Agreement																																																																																																																																																																									80.00%	80.00%
Percentage of Project to be Deferred and Recovered in a Future Rate Case per Settlement Agreement																																																																																																																																																																									20.00%	20.00%
Construction Work in Progress	2,489,000,000		2,489,000,000		1,819,000,000																											250,040,000	266,247,000																					223,860,000		223,860,000		99,783,000									440,199,000		440,199,000		354,497,000											118,879,000	95,170,000							388,835,000	341,063,000																																																												285,000,000	285,000,000															93,000,000	48,000,000
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
Deferred Charges and Other Noncurrent Assets	$ 1,414,000,000		$ 1,414,000,000		$ 1,627,000,000																											$ 96,016,000	$ 115,078,000																					$ 81,848,000		$ 81,848,000		$ 76,432,000									$ 133,024,000		$ 133,024,000		$ 320,026,000											$ 17,217,000	$ 8,560,000							$ 87,016,000	$ 111,364,000