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Operating Revenue (Narrative) (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Revenues From Contract With Customer [Line Items] |  |  |
Contract asset balances | $ 25 |  | $ 28
Contract liability balances | 109 |  | 123
Revenue recognized from contract liability balances | 106 | $ 91 |
Dominion Energy Gas Holdings, LLC |  |  |
Revenues From Contract With Customer [Line Items] |  |  |
Contract asset balances | 35 |  | 40
Contract liability balances | 21 |  | 20
Revenue recognized from contract liability balances | 1 | 28 |
Virginia Electric and Power Company |  |  |
Revenues From Contract With Customer [Line Items] |  |  |
Contract liability balances | 37 |  | $ 24
Revenue recognized from contract liability balances | $ 24 | $ 22 |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 + Details
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