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Income Taxes (Unrecognized Tax Benefits) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance at January 1 |  | $ 38 | $ 64 | $ 103
Increases-prior period positions |  | 10 | 1 | 9
Decreases-prior period positions |  |  | (9) | (44)
Increases-current period positions |  | 10 | 5 | 6
Settlements with tax authorities |  | (6) | (23) | (8)
Expiration of statutes of limitations |  | (8) |  | (2)
Balance at December 31 |  | 44 | 38 | 64
Virginia Electric and Power Company |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance at January 1 |  | 4 | 13 | 12
Increases-prior period positions |  |  |  | 4
Decreases-prior period positions |  |  | (1) | (3)
Settlements with tax authorities | $ (8) | (1) | (8) |
Expiration of statutes of limitations |  | (1) |  |
Balance at December 31 |  | $ 2 | 4 | 13
Dominion Energy Gas Holdings, LLC |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance at January 1 |  |  | 7 | 29
Increases-prior period positions |  |  |  | 1
Decreases-prior period positions |  |  |  | (19)
Settlements with tax authorities |  |  | $ (7) | (4)
Balance at December 31 |  |  |  | $ 7

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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