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Leases (Narrative) (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2016 | Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | [1]
Leases Disclosure [Line Items] |  |  |  |
Property, plant and equipment, net |  | $ 67,141 | $ 67,141 | $ 54,560
Accumulated depreciation, depletion and amortization |  | 27,732 | 27,732 | $ 22,018
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 |  |  | 340 |
Required percentage payment of funded amount under certain events of default | 89.90% |  |  |
Required percentage payment for specific full recourse events | 100.00% |  |  |
Lease term | 5 years |  |  |
Extension term of lease | 5 years |  |  |
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 |  |  |
Required percentage payment to lessor for difference between project costs and sales proceeds | 87.00% |  |  |
Power Purchase Arrangements |  |  |  |
Leases Disclosure [Line Items] |  |  |  |
Property, plant and equipment, net |  | 2,800 | 2,800 |
Accumulated depreciation, depletion and amortization |  | 318 | 318 |
Rental revenue |  | 53 | 82 |
Depreciation expense |  | $ 24 | $ 47 |
[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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