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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | $ 34 | $ 42
Contract liability balances | 127 | 106
Revenue recognized from contract liability balances | 92 |
Dominion Energy Gas Holdings, LLC |  |
Revenues From Contract With Customer [Line Items] |  |
Contract asset balances | 47 | 58
Contract liability balances | 38 | 40
Revenue recognized from contract liability balances | 40 |
Virginia Electric and Power Company |  |
Revenues From Contract With Customer [Line Items] |  |
Contract liability balances | 25 | $ 22
Revenue recognized from contract liability balances | $ 22 |

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