v3.26.1
SIGNIFICANT ACCOUNTING MATTERS - Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accounting Policies [Abstract]        
Earnings Attributable to AEP Common Shareholders, Basic $ 713 $ 1,226 $ 1,587 $ 2,026
Earnings Attributable to AEP Common Shareholders, Diluted $ 713 $ 1,226 $ 1,587 $ 2,026
Weighted-Average Number of Basic AEP Common Shares Outstanding (in shares) 544,163,341 534,283,554 543,127,062 533,839,985
Weighted-Average Number of Basic AEP Common Shares Outstanding (in dollars per share) $ 1.31 $ 2.29 $ 2.92 $ 3.80
Weighted-Average Dilutive Effect (in shares) 6,400,000 2,100,000 5,700,000 1,700,000
Weighted-Average Dilutive Effect (in dollars per share) $ (0.01) $ 0 $ (0.03) $ (0.02)
Weighted-Average Number of Diluted AEP Common Shares Outstanding (in shares) 550,628,111 536,425,635 548,846,865 535,547,029
Weighted-Average Number of Diluted AEP Common Shares Outstanding (in dollars per share) $ 1.30 $ 2.29 $ 2.89 $ 3.78