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EFFECTS OF REGULATION - Regulatory Assets - APCo (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Nov. 30, 2025
Dec. 31, 2024
Regulatory Asset [Line Items]      
Total Current Regulatory Assets $ 426   $ 446
Total Noncurrent Regulatory Assets 4,804   5,129
Storm-Related Costs | Regulatory Assets Currently Not Earning Return | WV      
Regulatory Asset [Line Items]      
Regulatory asset, requested to be financed through securitization 40    
Pending final regulatory approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 1,307   1,311
Approved for recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 3,497   3,818
Earns/earning a return | Under-recovered Fuel Costs      
Regulatory Asset [Line Items]      
Total Current Regulatory Assets $ 140   246
Remaining Recovery Period 1 year    
Earns/earning a return | Pending final regulatory approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 435   395
Earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 23   21
Earns/earning a return | Pending final regulatory approval | Storm-Related Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 43   51
Earns/earning a return | Approved for recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 1,341   1,711
Earns/earning a return | Approved for recovery | Plant Retirement Costs - Asset Retirement Obligation Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 1   111
Remaining Recovery Period 15 years    
Earns/earning a return | Approved for recovery | Storm-Related Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 100   107
Remaining Recovery Period 6 years    
Earns/earning a return | Approved for recovery | Long-term Under-recovered Fuel Costs - West Virginia      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 254   284
Remaining Recovery Period 9 years    
Earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 470   661
Remaining Recovery Period 21 years    
Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 199   204
Does not earns/earning a return | Under-recovered Fuel Costs      
Regulatory Asset [Line Items]      
Total Current Regulatory Assets $ 202   116
Remaining Recovery Period 1 year    
Does not earns/earning a return | Pending final regulatory approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 872   916
Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 163   87
Does not earns/earning a return | Pending final regulatory approval | Plant Retirement Costs - Asset Retirement Obligation Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 257   357
Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 191   301
Does not earns/earning a return | Approved for recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 2,156   2,107
Does not earns/earning a return | Approved for recovery | Plant Retirement Costs - Asset Retirement Obligation Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 459   360
Remaining Recovery Period 17 years    
Does not earns/earning a return | Approved for recovery | Storm-Related Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 158   67
Remaining Recovery Period 6 years    
Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 222   229
Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 796   974
Remaining Recovery Period 12 years    
Does not earns/earning a return | Approved for recovery | Unamortized Loss on Reacquired Debt      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 85   91
Remaining Recovery Period 23 years    
Does not earns/earning a return | Approved for recovery | Postemployment Benefits      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 28   28
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY      
Regulatory Asset [Line Items]      
Total Current Regulatory Assets $ 83   148
Total Noncurrent Regulatory Assets 1,439   1,366
Regulatory asset, requested to be financed through securitization 2,528    
APPALACHIAN POWER COMPANY | Storm-Related Costs      
Regulatory Asset [Line Items]      
Regulatory asset, requested to be financed through securitization 158    
APPALACHIAN POWER COMPANY | Storm-Related Costs | Virginia      
Regulatory Asset [Line Items]      
Regulatory asset, requested to be financed through securitization, approved   $ 141  
APPALACHIAN POWER COMPANY | Storm-Related Costs | Regulatory Assets Currently Not Earning Return | WV      
Regulatory Asset [Line Items]      
Regulatory asset, requested to be financed through securitization 40    
APPALACHIAN POWER COMPANY | Pending final regulatory approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 440   535
APPALACHIAN POWER COMPANY | Approved for recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 999   831
APPALACHIAN POWER COMPANY | Earns/earning a return | Under-recovered Fuel Costs      
Regulatory Asset [Line Items]      
Total Current Regulatory Assets $ 71   148
Remaining Recovery Period 1 year    
APPALACHIAN POWER COMPANY | Earns/earning a return | Pending final regulatory approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 2   1
APPALACHIAN POWER COMPANY | Earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 2   1
APPALACHIAN POWER COMPANY | Earns/earning a return | Approved for recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 225   227
APPALACHIAN POWER COMPANY | Earns/earning a return | Approved for recovery | Long-term Under-recovered Fuel Costs - West Virginia      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 138   154
Remaining Recovery Period 9 years    
APPALACHIAN POWER COMPANY | Earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 64   68
Remaining Recovery Period 18 years    
APPALACHIAN POWER COMPANY | Earns/earning a return | Approved for recovery | Excess SO2 Allowance Inventory      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 16   0
Remaining Recovery Period 14 years    
APPALACHIAN POWER COMPANY | Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 7   5
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Under-recovered Fuel Costs      
Regulatory Asset [Line Items]      
Total Current Regulatory Assets $ 12   0
Remaining Recovery Period 1 year    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 438   534
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 18   12
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | Plant Retirement Costs - Asset Retirement Obligation Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 169   282
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | 2024-2025 Virginia Biennial Under-Earnings      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 172   78
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 39   144
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | Pension Settlement      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 16   18
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | Virginia Corporate Alternative Minimum Tax      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 13   0
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Pending final regulatory approval | West Virginia Corporate Alternative Minimum Tax      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 11   0
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets 774   604
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Plant Retirement Costs - Asset Retirement Obligation Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 404   308
Remaining Recovery Period 16 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 10   30
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Storm-Related Costs - West Virginia      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 107   0
Remaining Recovery Period 5 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 89   108
Remaining Recovery Period 12 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Unamortized Loss on Reacquired Debt      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 63   67
Remaining Recovery Period 20 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Virginia Retail Consumable Costs      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 17   0
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Virginia Transmission Rate Adjustment Clause      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 16   3
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Virginia Clean Economy Act      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 16   0
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | 2020-2022 Virginia Triennial Under-Earnings      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 14   26
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Postemployment Benefits      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 13   13
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Vegetation Management Program - West Virginia      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 12   12
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Peak Demand Reduction/Energy Efficiency      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 10   14
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Virginia Generation Rate Adjustment Clause      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 3   12
Remaining Recovery Period 2 years    
APPALACHIAN POWER COMPANY | Does not earns/earning a return | Approved for recovery | Excess SO2 Allowance Inventory      
Regulatory Asset [Line Items]      
Total Noncurrent Regulatory Assets $ 0   $ 11
Remaining Recovery Period 14 years