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Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail) - Virginia Electric and Power Company $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($)
Rider SNA |
Public Utilities General Disclosures [Line Items] |
Total revenue requirement | $ 107
Rider T1 |
Public Utilities General Disclosures [Line Items] |
Total revenue requirement | 706
Rider U |
Public Utilities General Disclosures [Line Items] |
Total revenue requirement | 95
Virginia Regulation | Previous Phase |
Public Utilities General Disclosures [Line Items] |
Projected capital investment | 60
Virginia Regulation | Rider SNA | Operating Segments | Transmission Component Of Virginia Powers |
Public Utilities General Disclosures [Line Items] |
Projected capital investment | 1,200
Virginia Regulation | Rider T1 | Operating Segments |
Public Utilities General Disclosures [Line Items] |
Total revenue requirement | 224
Virginia Regulation | Rider T1 | Operating Segments | Transmission Component Of Virginia Powers |
Public Utilities General Disclosures [Line Items] |
Total revenue requirement | 482
Virginia Regulation | Rider U | Previous Phase |
Public Utilities General Disclosures [Line Items] |
Projected capital investment | $ 35

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