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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers $ 5,631.6 $ 5,085.0
Total Revenues 5,463.4 5,025.7
Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues 0.0 0.0
Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 3,948.7 3,810.4
Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 2,091.3 1,916.1
Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1,046.9 1,042.1
Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 740.7 783.0
Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 69.8 69.2
Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1,566.8 1,162.8
Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 356.0 263.4
Transmission Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 389.1 368.8
Renewable Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers   4.9
Retail, Trading and Marketing Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 821.7 525.7
Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 116.1 111.8
Total Revenues 131.8 125.4
Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (168.2) (59.3)
Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 3.3 1.5
Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (171.5) (60.8)
AEP Texas    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 524.4 468.2
Total Revenues 523.0 466.4
AEP Texas | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 341.6 303.5
AEP Texas | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 171.9 147.3
AEP Texas | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 119.3 110.9
AEP Texas | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 39.5 35.6
AEP Texas | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 10.9 9.7
AEP Texas | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 173.3 155.9
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 173.3 155.9
AEP Texas | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 9.5 8.8
Total Revenues 1.7 2.1
AEP Texas | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (1.4) (1.8)
AEP Texas | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (1.5) (1.8)
AEP Texas | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 0.1 0.0
AEPTCo    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 514.8 483.5
Total Revenues 527.1 482.8
AEPTCo | 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 | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 505.9 475.4
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 505.9 475.4
AEPTCo | Transmission Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 407.0 384.0
AEPTCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 8.9 8.1
Total Revenues 0.0 2.4
AEPTCo | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 12.3 (0.7)
AEPTCo | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 12.4 (0.7)
AEPTCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (0.1) 0.0
APCo    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1,166.3 1,093.0
Total Revenues 1,172.9 1,093.0
APCo | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1,020.5 939.1
APCo | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 606.4 526.3
APCo | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 194.5 188.3
APCo | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 191.4 196.4
APCo | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 28.2 28.1
APCo | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 131.4 132.2
APCo | Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 89.6 85.1
APCo | Generation Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 45.0 41.0
APCo | Transmission Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 41.8 47.1
APCo | Transmission Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 19.0 21.0
APCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 14.4 21.7
Total Revenues 3.4 5.6
APCo | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 6.6 0.0
APCo | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 6.5 (0.1)
APCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 0.1 0.1
I&M    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 755.1 693.8
Total Revenues 722.2 667.4
I&M | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 519.5 518.8
I&M | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 232.1 224.8
I&M | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 152.5 144.8
I&M | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 133.7 147.9
I&M | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1.2 1.3
I&M | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 205.5 147.4
I&M | Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 195.1 137.3
I&M | Transmission Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 10.4 10.1
I&M | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 30.1 27.6
I&M | Other Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 18.0 18.0
I&M | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (32.9) (26.4)
I&M | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (0.2) (0.5)
I&M | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (32.7) (25.9)
OPCo    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 993.5 1,013.3
Total Revenues 1,003.5 1,023.8
OPCo | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 917.5 947.3
OPCo | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 567.2 556.5
OPCo | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 262.3 286.1
OPCo | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 83.5 100.5
OPCo | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 4.5 4.2
OPCo | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 23.7 23.8
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 23.7 23.8
OPCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 52.3 42.2
Total Revenues 3.6 2.7
OPCo | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 10.0 10.5
OPCo | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 5.0 2.6
OPCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 5.0 7.9
PSO    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 394.0 388.0
Total Revenues 394.0 387.8
PSO | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 367.8 363.0
PSO | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 175.3 158.2
PSO | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 101.9 103.0
PSO | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 70.4 80.3
PSO | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 20.2 21.5
PSO | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 17.9 13.0
PSO | Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 4.1 2.2
PSO | Transmission Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 13.8 10.8
PSO | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 8.3 12.0
Total Revenues 3.3 6.2
PSO | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 0.0 (0.2)
PSO | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 0.1 (0.2)
PSO | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (0.1) 0.0
SWEPCo    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 530.4 516.3
Total Revenues 531.1 516.2
SWEPCo | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 425.7 420.0
SWEPCo | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 192.6 182.4
SWEPCo | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 140.7 140.0
SWEPCo | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 89.7 95.0
SWEPCo | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 2.7 2.6
SWEPCo | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 94.6 86.7
SWEPCo | Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 55.7 47.1
SWEPCo | Transmission Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 38.9 39.6
SWEPCo | Transmission Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 10.0 14.0
SWEPCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 10.1 9.6
Total Revenues 3.6 3.9
SWEPCo | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 0.7 (0.1)
SWEPCo | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 0.8 (0.1)
SWEPCo | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (0.1) 0.0
Operating Segments    
Disaggregation of Revenue [Line Items]    
Total Revenues 5,953.3 5,498.9
Operating Segments | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues 505.8 488.1
Operating Segments | AEPTCo    
Disaggregation of Revenue [Line Items]    
Total Revenues 527.1 482.8
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 43.0 60.9
Total Revenues 44.6 52.8
Corporate and Other | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues 28.7 37.9
Corporate and Other | 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 | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers (0.2) 0.5
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 | Renewable Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers   0.0
Corporate and Other | Retail, Trading and Marketing Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers (0.2) 0.5
Corporate and Other | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 43.2 60.4
Corporate and Other | Other Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 29.0 48.0
Corporate and Other | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 1.6 (8.1)
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 1.6 (8.1)
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 (517.0) (535.0)
Total Revenues (534.5) (526.0)
Reconciling Adjustments | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues (534.5) (526.0)
Reconciling Adjustments | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers (0.2) (0.2)
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 (0.2) (0.2)
Reconciling Adjustments | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 0.0 0.0
Reconciling Adjustments | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers (466.4) (466.1)
Reconciling Adjustments | Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 0.0 0.1
Reconciling Adjustments | Transmission Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers (450.2) (418.6)
Reconciling Adjustments | Renewable Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers   (1.4)
Reconciling Adjustments | Retail, Trading and Marketing Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers (16.2) (46.2)
Reconciling Adjustments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers (50.4) (68.7)
Reconciling Adjustments | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (17.5) 9.0
Reconciling Adjustments | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (15.3) 1.0
Reconciling Adjustments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (2.2) 8.0
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 39.0  
VIU | Operating Segments    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 3,167.2 2,974.3
Total Revenues 3,137.8 2,947.9
VIU | Operating Segments | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues 52.3 46.7
VIU | Operating Segments | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 2,689.7 2,559.8
VIU | Operating Segments | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1,352.3 1,212.3
VIU | Operating Segments | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 665.2 645.1
VIU | Operating Segments | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 617.8 647.1
VIU | Operating Segments | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 54.4 55.3
VIU | Operating Segments | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 425.9 354.8
VIU | Operating Segments | Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 305.0 235.9
VIU | Operating Segments | Transmission Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 120.9 118.9
VIU | Operating Segments | Renewable Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers   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
VIU | Operating Segments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 51.6 59.7
VIU | Operating Segments | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (29.4) (26.4)
VIU | Operating Segments | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 3.3 (0.7)
VIU | Operating Segments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (32.7) (25.7)
T&D | Operating Segments    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1,518.1 1,481.6
Total Revenues 1,526.5 1,490.2
T&D | Operating Segments | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues 11.0 7.0
T&D | Operating Segments | Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1,259.2 1,250.8
T&D | Operating Segments | Residential Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 739.0 703.8
T&D | Operating Segments | Commercial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 381.7 397.0
T&D | Operating Segments | Industrial Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 123.1 136.1
T&D | Operating Segments | Other Retail Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 15.4 13.9
T&D | Operating Segments | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 197.0 179.8
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 197.0 179.8
T&D | Operating Segments | Renewable Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers   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
T&D | Operating Segments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 61.9 51.0
T&D | Operating Segments | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 8.4 8.6
T&D | Operating Segments | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 3.5 0.7
T&D | Operating Segments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 4.9 7.9
AEPTHCo | Transmission Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 411.0 387.0
AEPTHCo | Operating Segments    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 530.2 496.8
Total Revenues 542.1 497.3
AEPTHCo | Operating Segments | 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 | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 521.4 488.7
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 521.4 488.7
AEPTHCo | Operating Segments | Renewable Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers   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
AEPTHCo | Operating Segments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 8.8 8.1
AEPTHCo | Operating Segments | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 11.9 0.5
AEPTHCo | Operating Segments | Alternative Revenue Programs    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 11.8 0.5
AEPTHCo | Operating Segments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Other Revenues 0.1 0.0
G&M | Retail, Trading and Marketing Revenues | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 16.0 46.0
G&M | Operating Segments    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 890.1 606.4
Total Revenues 746.9 563.5
G&M | Operating Segments | Related Party    
Disaggregation of Revenue [Line Items]    
Total Revenues 16.3 47.6
G&M | Operating Segments | 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 | Wholesale and Competitive Retail Revenues:    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 889.1 605.1
G&M | Operating Segments | Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 51.0 27.4
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 | Renewable Generation Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers   6.3
G&M | Operating Segments | Retail, Trading and Marketing Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 838.1 571.4
G&M | Operating Segments | Other Revenues    
Disaggregation of Revenue [Line Items]    
Total Revenues from Contracts with Customers 1.0 1.3
G&M | Operating Segments | Alternative and Other    
Disaggregation of Revenue [Line Items]    
Total Other Revenues (143.2) (42.9)
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 $ (143.2) $ (42.9)