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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - APCo - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES        
Cash Flow Hedges, Net of Tax $ 5 $ (16) $ 12 $ (26)
Amortization of Pension and OPEB Deferred Costs, Net of Tax 1 0 3 1
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 6 (16) 15 (25)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS 1,193 956 2,789 2,973
APPALACHIAN POWER COMPANY        
Net Income 124 81 369 353
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES        
Cash Flow Hedges, Net of Tax 0 0 (1) (1)
Amortization of Pension and OPEB Deferred Costs, Net of Tax 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 0 0 (1) (1)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS $ 124 $ 81 $ 368 $ 352