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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | $ 46 | $ 46
Contract liability balances | 71 | 132
Revenue recognized from contract liability balances | 88 |
Dominion Energy Gas Holdings, LLC |  |
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | 64 | 66
Contract liability balances | 14 | 41
Revenue recognized from contract liability balances | 40 |
Virginia Electric and Power Company |  |
Revenues From Contract With Customer [Line Items] |  |
Contract liability balances | 25 | $ 50
Revenue recognized from contract liability balances | $ 21 |

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