v3.25.2
REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers $ 5,055.4 $ 4,657.6 $ 10,470.5 $ 9,742.6
Total Revenues 5,086.9 4,579.2 10,550.3 9,604.9
Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 0.0 0.0 0.0 0.0
Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 3,735.6 3,485.3 7,684.3 7,295.7
Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,641.5 1,599.2 3,732.8 3,515.3
Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,170.1 1,040.9 2,217.0 2,083.0
Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 849.4 775.7 1,590.1 1,558.7
Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 74.6 69.5 144.4 138.7
Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,229.7 1,072.4 2,580.0 2,235.2
Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 275.6 172.6 631.6 436.0
Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 430.8 430.9 819.9 799.7
Renewable Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   6.8   11.7
Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 523.3 462.1 1,128.5 987.8
Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 90.1 99.9 206.2 211.7
Total Revenues 158.8 135.9 290.6 261.3
Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 31.5 (78.4) 79.8 (137.7)
Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 29.4 (35.6) 32.7 (34.1)
Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2.1 (42.8) 47.1 (103.6)
AEP Texas        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 531.1 538.4 1,055.5 1,006.6
Total Revenues 531.2 539.6 1,054.2 1,006.0
AEP Texas | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 346.6 343.2 688.2 646.7
AEP Texas | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 180.2 184.9 352.1 332.2
AEP Texas | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 114.6 115.0 233.9 225.9
AEP Texas | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 41.7 34.0 81.2 69.6
AEP Texas | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 10.1 9.3 21.0 19.0
AEP Texas | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 175.4 184.8 348.7 340.7
AEP Texas | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEP Texas | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 175.4 184.8 348.7 340.7
AEP Texas | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 9.1 10.4 18.6 19.2
Total Revenues 1.5 0.5 3.2 2.6
AEP Texas | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.1 1.2 (1.3) (0.6)
AEP Texas | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.4 1.2 (1.1) (0.6)
AEP Texas | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (0.3) 0.0 (0.2) 0.0
AEPTCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 691.2 489.4 1,206.0 972.9
Total Revenues 741.8 475.2 1,268.9 958.0
AEPTCo | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTCo | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 682.3 483.2 1,188.2 958.6
AEPTCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 682.3 483.2 1,188.2 958.6
AEPTCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 555.0 389.0 962.0 773.0
AEPTCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 8.9 6.2 17.8 14.3
Total Revenues 0.1 0.4 0.1 2.8
AEPTCo | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 50.6 (14.2) 62.9 (14.9)
AEPTCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 50.5 (14.2) 62.9 (14.9)
AEPTCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.1 0.0 0.0 0.0
APCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 940.2 916.7 2,106.5 2,009.7
Total Revenues 947.6 910.2 2,120.5 2,003.2
APCo | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 797.9 785.9 1,818.4 1,725.0
APCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 365.2 364.8 971.6 891.1
APCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 194.0 187.1 388.5 375.4
APCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 210.5 205.9 401.9 402.3
APCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 28.2 28.1 56.4 56.2
APCo | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 123.8 117.7 255.2 249.9
APCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 77.9 72.1 167.5 157.2
APCo | Generation Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 36.0 36.0 81.0 77.0
APCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 45.9 45.6 87.7 92.7
APCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 22.0 22.0 41.0 43.0
APCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 18.5 13.1 32.9 34.8
Total Revenues 5.2 3.7 8.6 9.3
APCo | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 7.4 (6.5) 14.0 (6.5)
APCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 7.2 (6.5) 13.7 (6.6)
APCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.2 0.0 0.3 0.1
I&M        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 724.0 589.9 1,479.0 1,283.7
Total Revenues 737.2 594.3 1,459.4 1,261.7
I&M | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 540.3 495.7 1,059.8 1,014.5
I&M | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 190.1 190.5 422.2 415.3
I&M | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 192.2 150.8 344.7 295.6
I&M | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 156.7 153.1 290.4 301.0
I&M | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1.3 1.3 2.5 2.6
I&M | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 156.8 64.8 362.3 212.2
I&M | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 138.2 54.8 333.3 192.1
I&M | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 18.6 10.0 29.0 20.1
I&M | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 26.9 29.4 56.9 57.0
I&M | Other Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 18.0 23.0 36.0 41.0
I&M | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 13.2 4.4 (19.6) (22.0)
I&M | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 1.2 0.0 1.0 (0.5)
I&M | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 12.0 4.4 (20.6) (21.5)
OPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 904.6 887.0 1,898.1 1,900.3
Total Revenues 919.0 896.3 1,922.5 1,920.1
OPCo | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 845.3 834.9 1,762.8 1,782.2
OPCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 431.5 465.3 998.7 1,021.8
OPCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 306.2 276.1 568.5 562.2
OPCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 103.5 89.0 187.0 189.5
OPCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 4.1 4.5 8.6 8.7
OPCo | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 22.0 23.6 45.7 47.4
OPCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
OPCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 22.0 23.6 45.7 47.4
OPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 37.3 28.5 89.6 70.7
Total Revenues 2.6 2.8 6.2 5.5
OPCo | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 14.4 9.3 24.4 19.8
OPCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 12.1 5.3 17.1 7.9
OPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2.3 4.0 7.3 11.9
PSO        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 467.6 460.2 861.6 848.2
Total Revenues 469.5 458.8 863.5 846.6
PSO | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 443.3 434.9 811.1 797.9
PSO | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 190.4 187.8 365.7 346.0
PSO | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 135.2 130.1 237.1 233.1
PSO | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 91.3 91.1 161.7 171.4
PSO | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 26.4 25.9 46.6 47.4
PSO | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 17.5 12.9 35.4 25.9
PSO | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1.5 2.7 5.6 4.9
PSO | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 16.0 10.2 29.8 21.0
PSO | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 6.8 12.4 15.1 24.4
Total Revenues 1.8 9.6 5.1 15.8
PSO | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 1.9 (1.4) 1.9 (1.6)
PSO | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 1.8 (1.4) 1.9 (1.6)
PSO | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.1 0.0 0.0 0.0
SWEPCo        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 562.3 399.8 1,092.7 916.1
Total Revenues 570.4 395.8 1,101.5 912.0
SWEPCo | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 452.6 295.4 878.3 715.4
SWEPCo | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 191.3 120.7 383.9 303.1
SWEPCo | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 155.4 100.7 296.1 240.7
SWEPCo | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 103.2 72.3 192.9 167.3
SWEPCo | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2.7 1.7 5.4 4.3
SWEPCo | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 104.0 96.8 198.6 183.5
SWEPCo | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 48.6 50.1 104.3 97.2
SWEPCo | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 55.4 46.7 94.3 86.3
SWEPCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 21.0 15.0 31.0 28.0
SWEPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 5.7 7.6 15.8 17.2
Total Revenues 0.5 2.4 4.1 6.3
SWEPCo | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 8.1 (4.0) 8.8 (4.1)
SWEPCo | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 8.0 (4.0) 8.8 (4.1)
SWEPCo | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.1 0.0 0.0 0.0
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues 5,788.2 5,012.3 11,741.5 10,511.2
Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 705.0 460.3 1,210.8 948.4
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27.4 55.5 70.4 116.4
Total Revenues 29.6 57.7 74.2 110.5
Corporate and Other | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 25.9 30.5 54.6 68.4
Corporate and Other | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Corporate and Other | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Corporate and Other | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Corporate and Other | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 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 0.0 0.0
Corporate and Other | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.3 (0.2) 0.8
Corporate and Other | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Corporate and Other | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Corporate and Other | Renewable Generation 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 0.3 (0.2) 0.8
Corporate and Other | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 27.4 55.2 70.6 115.6
Corporate and Other | Other Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 26.0 30.0 55.0 79.0
Corporate and Other | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2.2 2.2 3.8 (5.9)
Corporate and Other | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.0 0.0 0.0 0.0
Corporate and Other | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2.2 2.2 3.8 (5.9)
Corporate and Other | AEPTCo        
Disaggregation of Revenue [Line Items]        
Total Revenues 0.0 0.0 0.0 0.0
Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (681.9) (471.1) (1,198.9) (1,006.1)
Total Revenues (730.9) (490.8) (1,265.4) (1,016.8)
Reconciling Adjustments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues (730.9) (490.8) (1,265.4) (1,016.8)
Reconciling Adjustments | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (0.3) (0.1) (0.5) (0.3)
Reconciling Adjustments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Reconciling Adjustments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Reconciling Adjustments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (0.3) (0.1) (0.5) (0.3)
Reconciling Adjustments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
Reconciling Adjustments | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (637.4) (422.2) (1,103.8) (888.3)
Reconciling Adjustments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 (0.1) 0.0 0.0
Reconciling Adjustments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (622.1) (397.0) (1,072.3) (815.6)
Reconciling Adjustments | Renewable Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   (1.4)   (2.8)
Reconciling Adjustments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (15.3) (23.7) (31.5) (69.9)
Reconciling Adjustments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers (44.2) (48.8) (94.6) (117.5)
Reconciling Adjustments | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (49.0) (19.7) (66.5) (10.7)
Reconciling Adjustments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (47.0) (17.3) (62.3) (16.3)
Reconciling Adjustments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (2.0) (2.4) (4.2) 5.6
Reconciling Adjustments | AEPTCo        
Disaggregation of Revenue [Line Items]        
Total Revenues 0.0 0.0 0.0 0.0
VIU | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 65.0 41.0 104.0 83.0
VIU | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2,988.2 2,626.8 6,155.4 5,601.1
Total Revenues 3,015.2 2,619.0 6,153.0 5,566.9
VIU | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 80.7 47.0 133.0 93.7
VIU | Operating Segments | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2,544.3 2,307.4 5,234.0 4,867.2
VIU | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,029.7 949.0 2,382.0 2,161.3
VIU | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 749.5 649.8 1,414.7 1,294.9
VIU | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 704.6 652.8 1,322.4 1,299.9
VIU | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 60.5 55.8 114.9 111.1
VIU | Operating Segments | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 394.5 272.0 820.4 626.8
VIU | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 237.3 149.0 542.3 384.9
VIU | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 157.2 123.0 278.1 241.9
VIU | Operating Segments | Renewable Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   0.0   0.0
VIU | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
VIU | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 49.4 47.4 101.0 107.1
VIU | Operating Segments | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 27.0 (7.8) (2.4) (34.2)
VIU | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 14.5 (12.1) 17.8 (12.8)
VIU | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 12.5 4.3 (20.2) (21.4)
T&D | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,435.2 1,425.2 2,953.3 2,906.8
Total Revenues 1,450.2 1,435.9 2,976.7 2,926.1
T&D | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 7.6 7.1 18.6 14.1
T&D | Operating Segments | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 1,191.6 1,178.0 2,450.8 2,428.8
T&D | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 611.8 650.2 1,350.8 1,354.0
T&D | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 420.6 391.1 802.3 788.1
T&D | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 145.1 123.0 268.2 259.1
T&D | Operating Segments | Other Retail Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 14.1 13.7 29.5 27.6
T&D | Operating Segments | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 197.4 208.3 394.4 388.1
T&D | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
T&D | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 197.4 208.3 394.4 388.1
T&D | Operating Segments | Renewable Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   0.0   0.0
T&D | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
T&D | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 46.2 38.9 108.1 89.9
T&D | Operating Segments | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 15.0 10.7 23.4 19.3
T&D | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 12.4 6.7 15.9 7.4
T&D | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 2.6 4.0 7.5 11.9
AEPTHCo | Transmission Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 558.0 393.0 969.0 780.0
AEPTHCo | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 707.2 502.8 1,237.4 999.6
Total Revenues 756.6 489.9 1,298.7 987.2
AEPTHCo | Operating Segments | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTHCo | Operating Segments | Residential Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTHCo | Operating Segments | Commercial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTHCo | Operating Segments | Industrial Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 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 0.0 0.0
AEPTHCo | Operating Segments | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 698.3 496.6 1,219.7 985.3
AEPTHCo | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTHCo | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 698.3 496.6 1,219.7 985.3
AEPTHCo | Operating Segments | Renewable Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   0.0   0.0
AEPTHCo | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
AEPTHCo | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 8.9 6.2 17.7 14.3
AEPTHCo | Operating Segments | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 49.4 (12.9) 61.3 (12.4)
AEPTHCo | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 49.5 (12.9) 61.3 (12.4)
AEPTHCo | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (0.1) 0.0 0.0 0.0
G&M | Retail, Trading and Marketing Revenues | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 16.0 24.0 32.0 70.0
G&M | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 579.3 518.4 1,252.9 1,124.8
Total Revenues 566.2 467.5 1,313.1 1,031.0
G&M | Operating Segments | Related Party        
Disaggregation of Revenue [Line Items]        
Total Revenues 15.2 25.0 31.5 72.6
G&M | Operating Segments | Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 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 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 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 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 0.0 0.0
G&M | Operating Segments | Wholesale and Competitive Retail Revenues:        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 576.9 517.4 1,249.5 1,122.5
G&M | Operating Segments | Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 38.3 23.7 89.3 51.1
G&M | Operating Segments | Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 0.0 0.0 0.0 0.0
G&M | Operating Segments | Renewable Generation Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers   8.2   14.5
G&M | Operating Segments | Retail, Trading and Marketing Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 538.6 485.5 1,160.2 1,056.9
G&M | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Revenues from Contracts with Customers 2.4 1.0 3.4 2.3
G&M | Operating Segments | Alternative and Other        
Disaggregation of Revenue [Line Items]        
Total Other Revenues (13.1) (50.9) 60.2 (93.8)
G&M | Operating Segments | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Total Other Revenues 0.0 0.0 0.0 0.0
G&M | Operating Segments | Other Revenues        
Disaggregation of Revenue [Line Items]        
Total Other Revenues $ (13.1) $ (50.9) $ 60.2 $ (93.8)