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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2020
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Payment of settlement of an agreement related to the offshore wind installation vessel under development | $ 47 |  |  |  |  |  |
Charge in connection with settlement of an agreement |  |  |  | $ 47 |  |  |
Charge in connection with settlement of an agreement, after tax |  |  |  | $ 35 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Lease agreement maturity period |  |  |  |  | 20 months |  |
Right-of-use asset and offsetting lease obligation |  | $ 228 |  |  | $ 228 |  |
Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Lease agreement maturity period |  |  |  |  | 5 years |  |
Rate implicit term in lease |  |  |  |  | 5 years |  |
Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel | Lessor |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Amount of financing commitments to fund estimated project costs |  |  |  |  |  |  | $ 715
Right-of-use asset and offsetting lease obligation |  | 214 |  |  | $ 214 |  |
CVOW Commercial Project | Virginia Electric and Power Company |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Affiliated lease cost |  | 11 |  |  | 11 |  |
Power Purchase Arrangement |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Rental revenue |  | $ 6 | $ 6 |  | $ 15 | $ 15 |
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues | Revenues |  | Revenues | Revenues |
Depreciation expense |  | $ 4 | $ 3 |  | $ 9 | $ 6 |

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