Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2014
Entity Registrant Name AMERICAN ELECTRIC POWER CO INC
Entity Central Index Key 0000004904
Document Type 10-K
Document Period End Date Dec. 31, 2014
Amendment Flag false
Document Fiscal Year Focus 2014
Document Fiscal Period Focus FY
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Public Float $ 27,293,981,162dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding 489,402,567dei_EntityCommonStockSharesOutstanding
Appalachian Power Co [Member]  
Entity Registrant Name APPALACHIAN POWER CO
Entity Central Index Key 0000006879
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 13,499,500dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= aep_AppalachianPowerCoMember
Indiana Michigan Power Co [Member]  
Entity Registrant Name INDIANA MICHIGAN POWER CO
Entity Central Index Key 0000050172
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 1,400,000dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= aep_IndianaMichiganPowerCoMember
Ohio Power Co [Member]  
Entity Registrant Name OHIO POWER CO
Entity Central Index Key 0000073986
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 27,952,473dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= aep_OhioPowerCoMember
Public Service Co Of Oklahoma [Member]  
Entity Registrant Name PUBLIC SERVICE CO OF OKLAHOMA
Entity Central Index Key 0000081027
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 9,013,000dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= aep_PublicServiceCoOfOklahomaMember
Southwestern Electric Power Co [Member]  
Entity Registrant Name SOUTHWESTERN ELECTRIC POWER CO
Entity Central Index Key 0000092487
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 7,536,640dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= aep_SouthwesternElectricPowerCoMember

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