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Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
Project
Agreement
Program
Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Additional total revenue requirement   $ 17
Public utilities requested rate increase annual revenue of pending applications approval   $ 36
Rider CE    
Public Utilities, General Disclosures [Line Items]    
Public utilities number of small scale solar project | Agreement   2
Public utilities number of power purchase agreements | Agreement   19
Rider CE | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement [1],[2]   $ 182
Public utilities number of solar generation projects | Project   2
Rider CE One | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement [2],[3]   $ 325
Public utilities number of solar generation projects | Project   6
Non-jurisdictional generation facilities aggregate recorded cost   $ 251
Public utilities number of energy storage project | Project   2
Public utilities number of small scale solar project | Project   3
Public utilities number of power purchase agreements | Agreement   10
Consolidation of Riders BW, GV and Four Other Riders | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement $ 348  
Electric Distribution Grid Transformation Projects | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   $ 100
Electric Distribution Grid Transformation Projects One | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   120
Underground Distribution Facilities | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   167
Underground Distribution Facilities One | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   178
Rural Broadband Capacity Project | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   35
Rider Associated With Rural Broadband Capacity Project [Member] | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   25
Rider T1 | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement [2],[4]   1,343
Rider T1 | Virginia Electric and Power Company | Operating Segments | Virginia Regulation    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   782
Rider T1 | Virginia Electric and Power Company | Operating Segments | Transmission Component Of Virginia Powers | Virginia Regulation    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement   561
Rider SNA | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement [2],[5]   207
Rider SNA | Virginia Electric and Power Company | Operating Segments | Second Phase Of Nuclear Life Extension Program | Virginia Regulation    
Public Utilities, General Disclosures [Line Items]    
Projected capital investment   1,700
DSM Riders | Virginia Electric and Power Company    
Public Utilities, General Disclosures [Line Items]    
Total revenue requirement [2],[6]   96
DSM Riders | Virginia Electric and Power Company | Virginia Regulation    
Public Utilities, General Disclosures [Line Items]    
Amount of cost cap recovery   $ 218
Public utilities energy efficiency program cost exceed percentage   15.00%
DSM Riders | Virginia Electric and Power Company | Operating Segments | Virginia Regulation    
Public Utilities, General Disclosures [Line Items]    
Number of new demand response programs | Program   1
Number of new redesigned demand response programs | Program   2
DSM Riders | Virginia Electric and Power Company | Energy Efficiency Program | Operating Segments | Virginia Regulation    
Public Utilities, General Disclosures [Line Items]    
Number of redesigned energy efficiency programs | Program   3
[1] Associated with two solar generation projects, two small-scale solar projects and 19 purchased power agreements in addition to previously approved Rider CE projects.
[2] In addition, Virginia Power has a rider associated with another project with a total annual revenue requirement of $17 million and a pending application associated with the Chesterfield Energy Reliability Center described above, which if approved would result in an annual revenue requirement increase of $36 million.
[3] Associated with six solar generation projects, including Bedford and Pumpkinseed (non-jurisdictional generation facilities with an aggregate recorded cost of $251 million at September 30, 2025), two energy storage projects, three small-scale solar projects, 10 purchased power agreements and certain costs associated with expanding solar and storage facilities in addition to previously approved Rider CE projects.
[4] Consists of $561 million for the transmission component of Virginia Power’s base rates and $782 million for Rider T1.
[5] The Virginia Commission also approved Virginia Power’s request for cost recovery of approximately $1.7 billion through Rider SNA for the second phase of the nuclear life extension program which includes investments for calendar years 2025 through 2027.
[6] Associated with three redesigned energy efficiency programs and one new and two redesigned demand response programs with a $218 million cost cap, with the ability to exceed the cost cap by no more than 15%.