v3.26.1
BUSINESS SEGMENTS - Schedule of AEP's Reportable Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Revenues from:          
Total Revenues $ 5,445 $ 5,087 $ 11,465 $ 10,550  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation 1,603 1,541 3,721 3,394  
Other Operation and Maintenance 1,258 928 2,419 1,999  
Asset Impairments and Other Related Charges 0 0 31 0  
Depreciation and Amortization 910 854 1,817 1,687  
Taxes Other Than Income Taxes 427 365 870 787  
Allowance for Equity Funds Used During Construction 75 57 145 114  
Interest Expense 585 489 1,137 984  
Income Tax Expense (Benefit) 52 (251) 96 (126)  
Equity Earnings of Unconsolidated Subsidiaries 29 21 54 59  
Other Segment Items 1 13 (14) (28)  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic 713 1,226 1,587 2,026  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted 713 1,226 1,587 2,026  
Gross Property Additions 3,126 3,279 6,921 5,379  
Total Assets 121,570   121,570   $ 114,460
Investments in Equity Method Investees 1,332   1,332   1,252
Nonrelated Party          
Revenues from:          
Total Revenues 5,445 5,087 11,465 10,550  
Related Party          
Revenues from:          
Total Revenues 0 0 0 0  
Operating Segments          
Revenues from:          
Total Revenues 6,022 5,787 12,621 11,741  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation 1,675 1,617 3,875 3,538  
Other Operation and Maintenance 1,773 1,568 3,432 3,096  
Asset Impairments and Other Related Charges     31    
Depreciation and Amortization 914 859 1,826 1,697  
Taxes Other Than Income Taxes 420 359 855 774  
Allowance for Equity Funds Used During Construction 75 57 145 114  
Interest Expense 451 362 871 733  
Income Tax Expense (Benefit) 65 (207) 146 (25)  
Equity Earnings of Unconsolidated Subsidiaries 25 23 50 48  
Other Segment Items (4) 12 (31) (33)  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic 828 1,297 1,811 2,123  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted 828 1,297 1,811 2,123  
Gross Property Additions 3,014 3,283 6,656 5,342  
Total Assets 120,254   120,254   112,772
Investments in Equity Method Investees 1,102   1,102   1,081
Operating Segments | Nonrelated Party          
Revenues from:          
Total Revenues 5,440 5,084 11,457 10,531  
Operating Segments | Related Party          
Revenues from:          
Total Revenues 582 703 1,164 1,210  
Operating Segments | VIU          
Revenues from:          
Total Revenues 3,120 3,015 6,560 6,153  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation 900 921 1,975 1,996  
Other Operation and Maintenance 1,055 981 2,072 1,865  
Asset Impairments and Other Related Charges     31    
Depreciation and Amortization 569 532 1,128 1,047  
Taxes Other Than Income Taxes 143 122 287 256  
Allowance for Equity Funds Used During Construction 21 16 44 32  
Interest Expense 264 202 509 402  
Income Tax Expense (Benefit) (64) (137) (112) (92)  
Equity Earnings of Unconsolidated Subsidiaries 1 1 1 1  
Other Segment Items (9) (22) (31) (45)  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic 284 433 746 757  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted 284 433 746 757  
Gross Property Additions 1,465 2,232 3,608 3,153  
Total Assets 65,606   65,606   61,778
Investments in Equity Method Investees 9   9   9
Operating Segments | VIU | Nonrelated Party          
Revenues from:          
Total Revenues 3,050 2,934 6,415 6,020  
Operating Segments | VIU | Related Party          
Revenues from:          
Total Revenues 70 81 145 133  
Operating Segments | T&D          
Revenues from:          
Total Revenues 1,583 1,449 3,192 2,976  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation 187 203 458 466  
Other Operation and Maintenance 655 541 1,235 1,118  
Asset Impairments and Other Related Charges     0    
Depreciation and Amortization 210 201 427 404  
Taxes Other Than Income Taxes 190 159 390 364  
Allowance for Equity Funds Used During Construction 28 19 53 38  
Interest Expense 117 99 222 211  
Income Tax Expense (Benefit) 37 51 77 85  
Equity Earnings of Unconsolidated Subsidiaries 0 0 0 1  
Other Segment Items (7) (10) (23) (22)  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic 222 224 459 389  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted 222 224 459 389  
Gross Property Additions 1,004 664 2,065 1,368  
Total Assets 30,878   30,878   29,272
Investments in Equity Method Investees 2   2   4
Operating Segments | T&D | Nonrelated Party          
Revenues from:          
Total Revenues 1,568 1,443 3,162 2,958  
Operating Segments | T&D | Related Party          
Revenues from:          
Total Revenues 15 6 30 18  
Operating Segments | AEPTHCo          
Revenues from:          
Total Revenues 610 757 1,208 1,299  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation 0 0 0 0  
Other Operation and Maintenance 57 46 110 83  
Asset Impairments and Other Related Charges     0    
Depreciation and Amortization 130 121 261 237  
Taxes Other Than Income Taxes 87 78 177 153  
Allowance for Equity Funds Used During Construction 26 22 48 44  
Interest Expense 68 59 137 116  
Income Tax Expense (Benefit) 63 (139) 130 (72)  
Equity Earnings of Unconsolidated Subsidiaries 24 22 49 46  
Other Segment Items 30 58 56 59  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic 225 578 434 813  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted 225 578 434 813  
Gross Property Additions 471 384 904 814  
Total Assets 20,832   20,832   19,719
Investments in Equity Method Investees 1,091   1,091   1,068
Operating Segments | AEPTHCo | Nonrelated Party          
Revenues from:          
Total Revenues 129 155 256 271  
Operating Segments | AEPTHCo | Related Party          
Revenues from:          
Total Revenues 481 602 952 1,028  
Operating Segments | G&M          
Revenues from:          
Total Revenues 709 566 1,661 1,313  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation 588 493 1,442 1,076  
Other Operation and Maintenance 6 0 15 30  
Asset Impairments and Other Related Charges     0    
Depreciation and Amortization 5 5 10 9  
Taxes Other Than Income Taxes 0 0 1 1  
Allowance for Equity Funds Used During Construction 0 0 0 0  
Interest Expense 2 2 3 4  
Income Tax Expense (Benefit) 29 18 51 54  
Equity Earnings of Unconsolidated Subsidiaries 0 0 0 0  
Other Segment Items (18) (14) (33) (25)  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic 97 62 172 164  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted 97 62 172 164  
Gross Property Additions 74 3 79 7  
Total Assets 2,938   2,938   2,003
Investments in Equity Method Investees 0   0   0
Operating Segments | G&M | Nonrelated Party          
Revenues from:          
Total Revenues 693 552 1,624 1,282  
Operating Segments | G&M | Related Party          
Revenues from:          
Total Revenues 16 14 37 31  
Corporate and Other          
Revenues from:          
Total Revenues 30 30 61 74  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation 0 0 0 0  
Other Operation and Maintenance 27 20 65 36  
Asset Impairments and Other Related Charges     0    
Depreciation and Amortization (4) (5) (9) (10)  
Taxes Other Than Income Taxes 0 0 0 1  
Allowance for Equity Funds Used During Construction 0 0 0 0  
Interest Expense 170 151 336 298  
Income Tax Expense (Benefit) (13) (44) (50) (101)  
Equity Earnings of Unconsolidated Subsidiaries 4 (2) 4 11  
Other Segment Items (31) (23) (53) (42)  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic (115) (71) (224) (97)  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted (115) (71) (224) (97)  
Gross Property Additions 136 6 283 36  
Total Assets 7,092   7,092   6,733
Investments in Equity Method Investees 230   230   171
Corporate and Other | Nonrelated Party          
Revenues from:          
Total Revenues 5 3 8 19  
Corporate and Other | Related Party          
Revenues from:          
Total Revenues 25 27 53 55  
Reconciling Adjustments          
Revenues from:          
Total Revenues (607) (730) (1,217) (1,265)  
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (72) (76) (154) (144)  
Other Operation and Maintenance (542) (660) (1,078) (1,133)  
Asset Impairments and Other Related Charges     0    
Depreciation and Amortization 0 0 0 0  
Taxes Other Than Income Taxes 7 6 15 12  
Allowance for Equity Funds Used During Construction 0 0 0 0  
Interest Expense (36) (24) (70) (47)  
Income Tax Expense (Benefit) 0 0 0 0  
Equity Earnings of Unconsolidated Subsidiaries 0 0 0 0  
Other Segment Items 36 24 70 47  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Basic 0 0 0 0  
EARNINGS (LOSS) ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS, Diluted 0 0 0 0  
Gross Property Additions (24) (10) (18) 1  
Total Assets (5,776)   (5,776)   (5,045)
Investments in Equity Method Investees 0   0   $ 0
Reconciling Adjustments | Nonrelated Party          
Revenues from:          
Total Revenues 0 0 0 0  
Reconciling Adjustments | Related Party          
Revenues from:          
Total Revenues $ (607) $ (730) $ (1,217) $ (1,265)