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Commitments and Contingencies (Lease Commitments) (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |  |
Rental expense |  | $ 113 | $ 104 | $ 99
Corporate office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Requested cash draws from lessor to fund project costs |  | 139 |  |
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 |  |  |
Required percentage payment to lessor for difference between project costs and sales proceeds | 87.00% |  |  |
Virginia Electric and Power Company |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Rental expense |  | 57 | 52 | 51
Dominion Gas Holdings, LLC |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Rental expense |  | $ 34 | $ 37 | $ 37
Lessor | Corporate office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Amount of financing commitments to fund estimated project costs | $ 365 |  |  |

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