v3.26.3
BUSINESS SEGMENTS - Narrative (Details)
9 Months Ended
Sep. 30, 2026
segment
company
Segment Reporting [Line Items]  
Number of reportable segments 1
APPALACHIAN POWER COMPANY  
Segment Reporting [Line Items]  
Number of reportable segments 1
INDIANA MICHIGAN POWER COMPANY  
Segment Reporting [Line Items]  
Number of reportable segments 1
PUBLIC SERVICE COMPANY OF OKLAHOMA  
Segment Reporting [Line Items]  
Number of reportable segments 1
SOUTHWESTERN ELECTRIC POWER COMPANY  
Segment Reporting [Line Items]  
Number of reportable segments 1
AEP Texas  
Segment Reporting [Line Items]  
Number of reportable segments 1
OHIO POWER COMPANY  
Segment Reporting [Line Items]  
Number of reportable segments 1
AEP TRANSMISSION COMPANY, LLC  
Segment Reporting [Line Items]  
Number of reportable segments 1
Number of FERC-regulated transmission-only electric utilities | company 7
Number of operating segments 7