v3.26.1
REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers $ 5,461 $ 5,055 $ 11,382 $ 10,470
Total Revenues 5,445 5,087 11,465 10,550
Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 0 0 0 0
Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 3,980 3,737 8,136 7,685
Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,734 1,642 3,831 3,733
Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,325 1,170 2,533 2,217
Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 847 849 1,624 1,590
Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 74 76 148 145
Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,307 1,228 2,914 2,579
Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 283 275 697 631
Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 437 431 881 820
Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 587 522 1,336 1,128
Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 174 90 332 206
Total Revenues 134 158 264 290
Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (16) 32 83 80
Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (8) 29 (11) 33
Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (8) 3 94 47
AEP TEXAS INC.        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 573 530 1,099 1,055
Total Revenues 571 531 1,095 1,054
AEP TEXAS INC. | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 361 346 681 688
AEP TEXAS INC. | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 190 180 348 352
AEP TEXAS INC. | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 119 115 233 234
AEP TEXAS INC. | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 42 41 79 81
AEP TEXAS INC. | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 10 10 21 21
AEP TEXAS INC. | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 195 176 381 349
AEP TEXAS INC. | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP TEXAS INC. | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 195 176 381 349
AEP TEXAS INC. | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 17 8 37 18
Total Revenues 10 1 19 3
AEP TEXAS INC. | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 1 (4) (1)
AEP TEXAS INC. | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 1 (4) (1)
AEP TEXAS INC. | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
AEP TRANSMISSION COMPANY, LLC        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 597 691 1,167 1,206
Total Revenues 588 742 1,166 1,269
AEP TRANSMISSION COMPANY, LLC | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP TRANSMISSION COMPANY, LLC | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP TRANSMISSION COMPANY, LLC | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP TRANSMISSION COMPANY, LLC | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP TRANSMISSION COMPANY, LLC | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP TRANSMISSION COMPANY, LLC | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 580 682 1,144 1,188
AEP TRANSMISSION COMPANY, LLC | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP TRANSMISSION COMPANY, LLC | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 580 682 1,144 1,188
AEP TRANSMISSION COMPANY, LLC | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 471 555 925 962
AEP TRANSMISSION COMPANY, LLC | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 17 9 23 18
Total Revenues 7 0 7 0
AEP TRANSMISSION COMPANY, LLC | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (9) 51 (1) 63
AEP TRANSMISSION COMPANY, LLC | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (9) 51 (1) 63
AEP TRANSMISSION COMPANY, LLC | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
APPALACHIAN POWER COMPANY        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 913 940 2,079 2,106
Total Revenues 916 947 2,083 2,120
APPALACHIAN POWER COMPANY | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 755 798 1,749 1,818
APPALACHIAN POWER COMPANY | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 348 366 937 972
APPALACHIAN POWER COMPANY | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 183 193 376 388
APPALACHIAN POWER COMPANY | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 197 211 383 402
APPALACHIAN POWER COMPANY | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27 28 53 56
APPALACHIAN POWER COMPANY | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 142 123 297 255
APPALACHIAN POWER COMPANY | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 83 77 177 167
APPALACHIAN POWER COMPANY | Generation Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 42 36 97 81
APPALACHIAN POWER COMPANY | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 59 46 120 88
APPALACHIAN POWER COMPANY | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 32 22 65 41
APPALACHIAN POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 16 19 33 33
Total Revenues 2 5 6 8
APPALACHIAN POWER COMPANY | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 3 7 4 14
APPALACHIAN POWER COMPANY | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2 7 3 14
APPALACHIAN POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 1 0 1 0
INDIANA MICHIGAN POWER COMPANY        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 831 724 1,768 1,479
Total Revenues 800 737 1,733 1,460
INDIANA MICHIGAN POWER COMPANY | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 627 540 1,268 1,060
INDIANA MICHIGAN POWER COMPANY | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 191 190 434 422
INDIANA MICHIGAN POWER COMPANY | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 275 192 526 345
INDIANA MICHIGAN POWER COMPANY | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 159 156 305 290
INDIANA MICHIGAN POWER COMPANY | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2 2 3 3
INDIANA MICHIGAN POWER COMPANY | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 158 157 426 362
INDIANA MICHIGAN POWER COMPANY | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 147 138 404 333
INDIANA MICHIGAN POWER COMPANY | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 11 19 22 29
INDIANA MICHIGAN POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 46 27 74 57
INDIANA MICHIGAN POWER COMPANY | Other Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 17 18 34 36
INDIANA MICHIGAN POWER COMPANY | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (31) 13 (35) (19)
INDIANA MICHIGAN POWER COMPANY | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (6) 1 (4) 1
INDIANA MICHIGAN POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (25) 12 (31) (20)
OHIO POWER COMPANY        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 995 905 2,070 1,899
Total Revenues 1,012 919 2,097 1,923
OHIO POWER COMPANY | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 933 845 1,898 1,763
OHIO POWER COMPANY | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 472 432 1,047 999
OHIO POWER COMPANY | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 354 307 649 569
OHIO POWER COMPANY | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 103 103 194 187
OHIO POWER COMPANY | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 4 3 8 8
OHIO POWER COMPANY | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27 22 55 46
OHIO POWER COMPANY | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
OHIO POWER COMPANY | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27 22 55 46
OHIO POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 35 38 117 90
Total Revenues 4 3 7 7
OHIO POWER COMPANY | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 17 14 27 24
OHIO POWER COMPANY | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 11 12 11 17
OHIO POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 6 2 16 7
PUBLIC SERVICE COMPANY OF OKLAHOMA        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 523 467 962 861
Total Revenues 521 469 960 863
PUBLIC SERVICE COMPANY OF OKLAHOMA | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 499 444 920 811
PUBLIC SERVICE COMPANY OF OKLAHOMA | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 224 191 410 366
PUBLIC SERVICE COMPANY OF OKLAHOMA | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 148 135 270 237
PUBLIC SERVICE COMPANY OF OKLAHOMA | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 97 92 186 162
PUBLIC SERVICE COMPANY OF OKLAHOMA | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 30 26 54 46
PUBLIC SERVICE COMPANY OF OKLAHOMA | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 18 17 33 35
PUBLIC SERVICE COMPANY OF OKLAHOMA | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 4 1 5 5
PUBLIC SERVICE COMPANY OF OKLAHOMA | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 14 16 28 30
PUBLIC SERVICE COMPANY OF OKLAHOMA | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 6 6 9 15
Total Revenues 0 2 1 5
PUBLIC SERVICE COMPANY OF OKLAHOMA | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 2 (2) 2
PUBLIC SERVICE COMPANY OF OKLAHOMA | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 2 (2) 2
PUBLIC SERVICE COMPANY OF OKLAHOMA | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
SOUTHWESTERN ELECTRIC POWER COMPANY        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 593 561 1,164 1,092
Total Revenues 588 570 1,159 1,101
SOUTHWESTERN ELECTRIC POWER COMPANY | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 480 451 933 878
SOUTHWESTERN ELECTRIC POWER COMPANY | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 208 191 406 384
SOUTHWESTERN ELECTRIC POWER COMPANY | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 166 155 324 296
SOUTHWESTERN ELECTRIC POWER COMPANY | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 105 103 197 193
SOUTHWESTERN ELECTRIC POWER COMPANY | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1 2 6 5
SOUTHWESTERN ELECTRIC POWER COMPANY | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 97 103 207 198
SOUTHWESTERN ELECTRIC POWER COMPANY | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 42 48 94 104
SOUTHWESTERN ELECTRIC POWER COMPANY | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 55 55 113 94
SOUTHWESTERN ELECTRIC POWER COMPANY | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 22 21 42 31
SOUTHWESTERN ELECTRIC POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 16 7 24 16
Total Revenues 2 1 3 4
SOUTHWESTERN ELECTRIC POWER COMPANY | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (5) 9 (5) 9
SOUTHWESTERN ELECTRIC POWER COMPANY | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (5) 9 (5) 9
SOUTHWESTERN ELECTRIC POWER COMPANY | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues 6,022 5,787 12,621 11,741
Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 582 703 1,164 1,210
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 28 27 57 70
Total Revenues 30 30 61 74
Corporate and Other | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 25 27 53 55
Corporate and Other | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Corporate and Other | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 28 27 57 70
Corporate and Other | Other Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27 26 56 55
Corporate and Other | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2 3 4 4
Corporate and Other | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
Corporate and Other | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2 3 4 4
Corporate and Other | AEP TRANSMISSION COMPANY, LLC        
Disaggregation of Revenue [Line Items]        
Total Revenues 0 0 0 0
Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (604) (682) (1,201) (1,199)
Total Revenues (607) (730) (1,217) (1,265)
Reconciling Adjustments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues (607) (730) (1,217) (1,265)
Reconciling Adjustments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Reconciling Adjustments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Reconciling Adjustments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Reconciling Adjustments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Reconciling Adjustments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Reconciling Adjustments | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (554) (638) (1,094) (1,104)
Reconciling Adjustments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
Reconciling Adjustments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (538) (622) (1,057) (1,072)
Reconciling Adjustments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (16) (16) (37) (32)
Reconciling Adjustments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (50) (44) (107) (95)
Reconciling Adjustments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (3) (48) (16) (66)
Reconciling Adjustments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 (47) (11) (62)
Reconciling Adjustments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (3) (1) (5) (4)
Reconciling Adjustments | AEP TRANSMISSION COMPANY, LLC        
Disaggregation of Revenue [Line Items]        
Total Revenues 0 0 0 0
VIU | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 63 65 118 104
VIU | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 3,152 2,988 6,596 6,155
Total Revenues 3,120 3,015 6,560 6,153
VIU | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 70 81 145 133
VIU | Operating Segments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2,686 2,545 5,557 5,234
VIU | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,072 1,030 2,436 2,382
VIU | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 852 750 1,651 1,415
VIU | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 702 704 1,351 1,322
VIU | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 60 61 119 115
VIU | Operating Segments | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 389 394 914 820
VIU | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 236 237 598 542
VIU | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 153 157 316 278
VIU | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
VIU | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 77 49 125 101
VIU | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (32) 27 (36) (2)
VIU | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (10) 15 (7) 18
VIU | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (22) 12 (29) (20)
T&D | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,570 1,435 3,171 2,953
Total Revenues 1,583 1,449 3,192 2,976
T&D | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 15 6 30 18
T&D | Operating Segments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,294 1,192 2,579 2,451
T&D | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 662 612 1,395 1,351
T&D | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 473 420 882 802
T&D | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 145 145 273 268
T&D | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 14 15 29 30
T&D | Operating Segments | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 223 197 437 394
T&D | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
T&D | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 223 197 437 394
T&D | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
T&D | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 53 46 155 108
T&D | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 13 14 21 23
T&D | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 9 12 7 16
T&D | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 4 2 14 7
AEPTHCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 475 558 933 969
AEPTHCo | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 617 708 1,208 1,238
Total Revenues 610 757 1,208 1,299
AEPTHCo | Operating Segments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTHCo | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTHCo | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTHCo | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTHCo | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTHCo | Operating Segments | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 599 699 1,185 1,220
AEPTHCo | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTHCo | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 599 699 1,185 1,220
AEPTHCo | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTHCo | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 18 9 23 18
AEPTHCo | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (7) 49 0 61
AEPTHCo | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (7) 49 0 61
AEPTHCo | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
G&M | Retail, Trading and Marketing Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 16 16 37 32
G&M | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 698 579 1,551 1,253
Total Revenues 709 566 1,661 1,313
G&M | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 16 14 37 31
G&M | Operating Segments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
G&M | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
G&M | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
G&M | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
G&M | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
G&M | Operating Segments | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 650 576 1,472 1,249
G&M | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 47 38 99 89
G&M | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
G&M | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 603 538 1,373 1,160
G&M | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 48 3 79 4
G&M | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 11 (13) 110 60
G&M | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
G&M | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues $ 11 $ (13) $ 110 $ 60