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Leases (Narrative) (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | [1]
Leases Disclosure [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  | $ 67,978 |  | $ 67,978 |  | $ 54,560
Accumulated depreciation, depletion and amortization |  | 28,144 |  | 28,144 |  | $ 22,018
Lease, term of commenced | 5 years |  |  |  |  |
Right-of-use asset | $ 67 | 159 | [2] | 159 | [2] |
Offsetting lease obligation | $ 67 | 162 |  | 162 |  |
Corporate office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |
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 |  | 2,800 |  |
Accumulated depreciation, depletion and amortization |  | 341 |  | 341 |  |
Rental revenue |  | 64 |  | 146 |  |
Depreciation expense |  | $ 23 |  | $ 70 |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Included in property, plant and equipment in the Companies’ Consolidated Balance Sheets, net of $39 million, $3 million and $1 million of accumulated amortization at Dominion Energy, Virginia Power and Dominion Energy Gas, respectively, at September 30, 2019.

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