v3.26.3
REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers $ 6,793 $ 5,963 $ 18,175 $ 16,433
Total Revenues 6,832 6,011 18,297 16,561
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 5,011 4,443 13,147 12,128
Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2,517 2,234 6,348 5,967
Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,515 1,284 4,048 3,501
Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 887 843 2,511 2,433
Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 92 82 240 227
Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,596 1,343 4,510 3,922
Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 456 311 1,153 942
Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 451 402 1,332 1,222
Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 689 630 2,025 1,758
Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 186 177 518 383
Total Revenues 134 126 398 416
Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 39 48 122 128
Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (14) 24 (25) 57
Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 53 24 147 71
AEP Texas        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 662 616 1,761 1,671
Total Revenues 659 619 1,754 1,673
AEP Texas | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 458 421 1,139 1,109
AEP Texas | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 272 244 620 596
AEP Texas | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 132 124 365 358
AEP Texas | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 43 42 122 123
AEP Texas | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 11 11 32 32
AEP Texas | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 192 184 573 533
AEP Texas | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEP Texas | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 192 184 573 533
AEP Texas | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 12 11 49 29
Total Revenues 2 2 21 5
AEP Texas | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (3) 3 (7) 2
AEP Texas | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (3) 4 (7) 3
AEP Texas | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 (1) 0 (1)
AEPTCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 596 528 1,763 1,734
Total Revenues 594 558 1,760 1,827
AEPTCo | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTCo | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 589 516 1,733 1,704
AEPTCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
AEPTCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 589 516 1,733 1,704
AEPTCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 477 419 1,400 1,400
AEPTCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 7 12 30 30
Total Revenues 2 0 9 0
AEPTCo | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 30 (3) 93
AEPTCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 30 (3) 93
AEPTCo | Alternative Revenue Programs | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   25   73
AEPTCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
APCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,132 1,050 3,211 3,156
Total Revenues 1,133 1,057 3,216 3,177
APCo | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 884 857 2,633 2,675
APCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 459 438 1,396 1,410
APCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 203 195 579 583
APCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 195 198 578 600
APCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27 26 80 82
APCo | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 199 151 496 406
APCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 137 107 314 274
APCo | Generation Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 42 41 139 122
APCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 62 44 182 132
APCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 34 19 99 60
APCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 49 42 82 75
Total Revenues 5 5 11 13
APCo | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 1 7 5 21
APCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (1) 6 2 20
APCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2 1 3 1
I&M        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 904 805 2,672 2,284
Total Revenues 894 812 2,627 2,272
I&M | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 680 617 1,948 1,677
I&M | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 245 249 679 671
I&M | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 281 217 807 562
I&M | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 153 150 458 440
I&M | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1 1 4 4
I&M | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 181 152 607 514
I&M | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 169 141 573 474
I&M | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 12 11 34 40
I&M | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 43 36 117 93
I&M | Other Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 23 19 57 55
I&M | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (10) 7 (45) (12)
I&M | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 1 (4) 2
I&M | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (10) 6 (41) (14)
OPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,200 1,048 3,270 2,947
Total Revenues 1,208 1,070 3,305 2,993
OPCo | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,128 949 3,026 2,712
OPCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 633 554 1,680 1,553
OPCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 385 298 1,034 867
OPCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 106 92 300 279
OPCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 4 5 12 13
OPCo | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 29 25 84 71
OPCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 0 0 0
OPCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 29 25 84 71
OPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 43 74 160 164
Total Revenues 5 3 12 10
OPCo | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 8 22 35 46
OPCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 4 14 15 31
OPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 4 8 20 15
PSO        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 870 694 1,832 1,555
Total Revenues 868 694 1,828 1,557
PSO | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 838 665 1,758 1,476
PSO | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 442 335 852 701
PSO | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 224 185 494 422
PSO | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 130 112 316 274
PSO | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 42 33 96 79
PSO | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 24 15 57 50
PSO | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 5 7 10 12
PSO | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 19 8 47 38
PSO | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 8 14 17 29
Total Revenues 2 4 3 9
PSO | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 0 (4) 2
PSO | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2) 0 (4) 2
PSO | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
SWEPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 779 722 1,943 1,814
Total Revenues 770 724 1,929 1,825
SWEPCo | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 658 602 1,591 1,480
SWEPCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 338 297 744 681
SWEPCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 202 189 526 485
SWEPCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 115 112 312 305
SWEPCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 3 4 9 9
SWEPCo | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 111 105 318 303
SWEPCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 51 44 145 148
SWEPCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 60 61 173 155
SWEPCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 26 28 68 59
SWEPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 10 15 34 31
Total Revenues 2 6 5 10
SWEPCo | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (9) 2 (14) 11
SWEPCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (9) 2 (14) 11
SWEPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0 0 0 0
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues 7,434 6,561 20,055 18,302
Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 603 556 1,767 1,766
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 36 34 93 104
Total Revenues 38 36 99 110
Corporate and Other | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 37 30 90 85
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 1 0 1 0
Corporate and Other | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1 0 1 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 35 34 92 104
Corporate and Other | Other Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 35 31 91 86
Corporate and Other | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2 2 6 6
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 2 6 6
Corporate and Other | AEPTCo        
Disaggregation of Revenue [Line Items]        
Total Revenues 0 0 0 0
Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (639) (552) (1,840) (1,751)
Total Revenues (640) (586) (1,857) (1,851)
Reconciling Adjustments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues (640) (586) (1,857) (1,851)
Reconciling Adjustments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0 (1) 0 (1)
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 (1) 0 (1)
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 (575) (498) (1,669) (1,602)
Reconciling Adjustments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 90 0 90 0
Reconciling Adjustments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (548) (480) (1,605) (1,552)
Reconciling Adjustments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (117) (18) (154) (50)
Reconciling Adjustments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (64) (53) (171) (148)
Reconciling Adjustments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (1) (34) (17) (100)
Reconciling Adjustments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2 (32) (9) (94)
Reconciling Adjustments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (3) (2) (8) (6)
Reconciling Adjustments | AEPTCo        
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 68 56 186 160
VIU | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 4,025 3,572 10,621 9,727
Total Revenues 4,001 3,586 10,561 9,739
VIU | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 78 75 223 208
VIU | Operating Segments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 3,423 3,074 8,980 8,308
VIU | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,612 1,436 4,048 3,818
VIU | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 997 861 2,648 2,276
VIU | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 738 710 2,089 2,032
VIU | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 76 67 195 182
VIU | Operating Segments | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 507 401 1,421 1,221
VIU | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 338 260 936 802
VIU | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 169 141 485 419
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 95 97 220 198
VIU | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (24) 14 (60) 12
VIU | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (14) 8 (21) 26
VIU | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (10) 6 (39) (14)
T&D | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,862 1,664 5,033 4,617
Total Revenues 1,868 1,690 5,060 4,666
T&D | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 15 10 45 28
T&D | Operating Segments | Total Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,588 1,370 4,167 3,821
T&D | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 905 798 2,300 2,149
T&D | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 518 423 1,400 1,225
T&D | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 149 134 422 402
T&D | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 16 15 45 45
T&D | Operating Segments | Total Wholesale and Competitive Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 220 210 657 604
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 220 210 657 604
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 54 84 209 192
T&D | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 6 26 27 49
T&D | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 1 18 8 34
T&D | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 5 8 19 15
AEPTHCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 480 423 1,400 1,400
AEPTHCo | Alternative Revenue Programs | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   25   74
AEPTHCo | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 618 543 1,826 1,781
Total Revenues 615 573 1,823 1,872
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 610 531 1,795 1,751
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 610 531 1,795 1,751
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 8 12 31 30
AEPTHCo | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (3) 30 (3) 91
AEPTHCo | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (3) 30 (3) 91
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 117 18 154 50
G&M | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 891 702 2,442 1,955
Total Revenues 950 712 2,611 2,025
G&M | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 28 18 65 49
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 833 699 2,305 1,948
G&M | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27 51 126 140
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 806 648 2,179 1,808
G&M | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 58 3 137 7
G&M | Operating Segments | Total Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 59 10 169 70
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 $ 59 $ 10 $ 169 $ 70