v3.26.3
SIGNIFICANT ACCOUNTING MATTERS - Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Accounting Policies [Abstract]        
Earnings Attributable to AEP Common Shareholders, Basic $ 1,187 $ 972 $ 2,774 $ 2,998
Earnings Attributable to AEP Common Shareholders, Diluted $ 1,187 $ 972 $ 2,774 $ 2,998
Weighted-Average Number of Basic AEP Common Shares Outstanding (in shares) 544,431,979 534,867,357 543,566,814 534,186,206
Weighted-Average Number of Basic AEP Common Shares Outstanding (in dollars per share) $ 2.18 $ 1.82 $ 5.10 $ 5.61
Weighted-Average Dilutive Effect (in shares) 5,700,000 3,100,000 5,700,000 2,200,000
Weighted-Average Dilutive Effect (in dollars per share) $ (0.02) $ (0.01) $ (0.05) $ (0.02)
Weighted-Average Number of Diluted AEP Common Shares Outstanding (in shares) 550,103,235 537,988,799 549,270,434 536,364,715
Weighted-Average Number of Diluted AEP Common Shares Outstanding (in dollars per share) $ 2.16 $ 1.81 $ 5.05 $ 5.59