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Leases (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jul. 31, 2016 | Mar. 31, 2019 | Dec. 31, 2018 | [1]
Leases Disclosure [Line Items] |  |  |
Property, plant and equipment, net |  | $ 66,567 | $ 54,560
Accumulated depreciation, depletion and amortization |  | 26,918 | $ 22,018
Option to extend, existence, finance lease | true |  |
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 |  | $ 310 |
Required percentage payment of funded amount under certain events of default | 89.90% |  |
Required percentage payment for specific full recourse events | 100.00% |  |
Option to extend, description, finance lease |  | 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, (ii) purchase the property for an amount equal to the project costs or, (iii) subject to certain terms and conditions, sell the property on behalf of the lessor to a third party using commercially reasonable efforts to obtain the highest cash purchase price for the property. |
Lease term | 5 years |  |
Extension term of lease | 5 years |  |
Required percentage payment to lessor for difference between project costs and sales proceeds | 87.00% |  |
Lessor | 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 | $ 365 |  |
Power Purchase Arrangements |  |  |
Leases Disclosure [Line Items] |  |  |
Property, plant and equipment, net |  | $ 2,800 |
Accumulated depreciation, depletion and amortization |  | 294 |
Rental revenue |  | 29 |
Depreciation expense |  | $ 23 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

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