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Operative Revenue (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | $ 42 | $ 46
Contract liability balances | 106 | 132
Revenue recognized from contract liability balances | 94 |
Dominion Energy Gas Holdings, LLC |  |
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | 58 | 66
Contract liability balances | 28 | 16
Revenue recognized from contract liability balances | 3 |
Virginia Electric and Power Company |  |
Revenues From Contract With Customer [Line Items] |  |
Contract liability balances | 22 | $ 50
Revenue recognized from contract liability balances | $ 25 |

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