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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Leases Disclosure [Line Items] |  |  |  |
Property, Plant and Equipment, Net | $ 57,848 | $ 57,200 | $ 57,848 | $ 57,200
Accumulated depreciation, depletion and amortization | 25,111 | 24,843 | $ 25,111 | 24,843
Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Requested cash draws from lessor to fund project costs | $ 187 |  |  |
Required percentage payment for specific full recourse events | 100.00% |  |  |
Lease maturity term | 2027-11 |  |  |
New Corporate Office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Requested cash draws from lessor to fund project costs |  | $ 61 |  |
Required percentage payment for specific full recourse events |  | 100.00% |  |
Finance lease, option to extend description |  |  | At the end of the initial lease term, Dominion Energy can (i) extend the term of the lease for an additional five years, subject to the approval of the participants, at current market terms |
Finance lease, option to extend |  |  | true |
Extension term of lease | 5 years |  | 5 years |
Required percentage payment to lessor for difference between project costs and sales proceeds |  |  | 83.00% |
Lessor | Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Amount of financing commitments to fund estimated project costs | $ 550 |  | $ 550 |
Lessor | New Corporate Office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Amount of financing commitments to fund estimated project costs |  | $ 465 |  | 465
Power Purchase Arrangement [Member] |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Property, Plant and Equipment, Net | 2,200 | 2,800 | 2,200 | 2,800
Accumulated depreciation, depletion and amortization | $ 68 | $ 364 | 68 | 364
Rental revenue |  |  | 175 | 174
Depreciation expense |  |  | $ 102 | $ 94

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