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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - APCo - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES        
Cash Flow Hedges, Net of Tax $ 22 $ (33) $ 7 $ (10)
Amortization of Pension and OPEB Deferred Costs, Net of Tax 1 0 2 1
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 23 (33) 9 (9)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS 736 1,193 1,596 2,017
APPALACHIAN POWER COMPANY        
Net Income 50 107 245 272
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES        
Cash Flow Hedges, Net of Tax (1) (1) (1) (1)
Amortization of Pension and OPEB Deferred Costs, Net of Tax 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) (1) (1) (1) (1)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS $ 49 $ 106 $ 244 $ 271