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Significant Accounting Policies (Narrative) (Detail) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 03, 2018 USD ($) | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) | Jan. 01, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Payments for sales and services due period |  |  |  |  | 1 month |  |
Cash provided by (used in) other investing activities |  |  |  |  | $ (3) | $ (4) |
Other adjustments |  |  |  |  | 42 | 64 |
Decrease in depreciation expense |  |  | $ 30 |  |  |  |
Decrease in depreciation expense, after tax |  |  | 23 |  |  |  |
Purchased gas |  |  | 64 | $ 112 | 404 | 417 |
Unrealized gains reclassified from AOCI to retained earnings |  |  | 1,100 |  | 1,100 |  |
Unrealized gains reclassified from AOCI to retained earnings after-tax |  |  |  |  | 734 |  |
Unrealized gain (loss) on securities recorded in other income, before tax | [1] |  | $ 73 |  | (11) |  |
Gain per share from unrealized loss on securities | $ / shares |  |  | $ 0.06 |  |  |  |
Other operations and maintenance |  |  | $ 1,007 | 827 | 1,803 | 1,611 |
Other income |  |  | 185 | 108 | 285 | 270 |
Tax reform, reclassification of tax expense (benefit) from AOCI to retained earnings |  |  |  |  | (289) |  |
Accounting Standards Update 2014-09 [Member] | Performing Processing And Fractionation Services |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  | 25 | 0 | 50 | 0 |
Other energy-related purchases |  |  | 25 | 0 | 50 | 0 |
Accounting Standards Update 2014-09 [Member] | Transportation And Storage Arrangements |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  |  | 31 |  | 63 |
Purchased gas |  |  |  | 31 |  | 63 |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Unrealized gain (loss) on securities recorded in other income, before tax |  |  | 45 |  | (2) |  |
Unrealized gain (loss) on securities recorded in other income, net of tax |  |  | 36 |  | (2) |  |
Cumulative Effect Of Changes In Accounting Principle [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Change in accounting principle to retained earnings and membership interest |  |  | 3 |  | 3 |  |
Cumulative Effect Of Changes In Accounting Principle [Member] | Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Change in accounting principle to retained earnings and membership interest |  |  | $ 127 |  | $ 127 |  |
Previously Reported |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash provided by (used in) other investing activities |  |  |  |  |  | 4 |
Other adjustments |  |  |  |  |  | (72) |
Other operations and maintenance |  |  |  | 779 |  | 1,500 |
Other income |  |  |  | 60 |  | 176 |
Merchant Solar Projects | Terra Nova Renewable Partners |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  | 33.00% |  | 33.00% |  |
Merchant Solar Projects | Terra Nova Renewable Partners | Call Option |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage ownership in total units |  |  | 67.00% |  | 67.00% |  |
Four Brothers and Three Cedars |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage ownership in total units |  |  | 50.00% |  | 50.00% |  |
Dominion Energy Midstream Partners, LP | Common Units |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  | 60.90% |  |
Dominion Energy Midstream Partners, LP | Convertible Preferred Interests |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership interest percentage of limited partner interests |  |  |  |  | 37.50% |  |
NRG Energy, Inc | Four Brothers and Three Cedars |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  |  | 33.00% |  | 33.00% |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash provided by (used in) other investing activities |  |  |  |  | $ (6) | (1) |
Other adjustments |  |  |  |  | (4) | 6 |
Purchased gas | [2] |  |  | 38 | 29 | 81 |
Other income |  |  | $ 32 | 27 | 65 | 52 |
Tax reform, reclassification of tax expense (benefit) from AOCI to membership interests |  |  |  |  | (26) |  |
Dominion Energy Gas Holdings, LLC | Accounting Standards Update 2014-09 [Member] | Performing Processing And Fractionation Services |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  | 25 | 0 | 50 | 0 |
Other energy-related purchases |  |  | 25 | 0 | 50 | 0 |
Dominion Energy Gas Holdings, LLC | Accounting Standards Update 2014-09 [Member] | Transportation And Storage Arrangements |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating revenue |  |  |  | 24 |  | 48 |
Purchased gas |  |  |  | 24 |  | 48 |
Dominion Energy Gas Holdings, LLC | Cumulative Effect Of Changes In Accounting Principle [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Change in accounting principle to retained earnings and membership interest |  |  | 3 |  | 3 |  |
Dominion Energy Gas Holdings, LLC | Previously Reported |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash provided by (used in) other investing activities |  |  |  |  |  | (11) |
Other operations and maintenance |  |  |  | 126 |  | 259 |
Other income |  |  |  | 5 |  | 10 |
Virginia Electric and Power Company |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash provided by (used in) other investing activities |  |  |  |  | 4 | (17) |
Other adjustments |  |  |  |  | 19 | 20 |
Decrease in depreciation expense |  |  | 46 |  |  |  |
Decrease in depreciation expense, after tax |  |  | 36 |  |  |  |
Unrealized gains reclassified from AOCI to retained earnings |  |  |  |  |  |  | $ 119
Unrealized gains reclassified from AOCI to retained earnings after-tax |  | $ 73 |  |  |  |  |
Net unrealized gains on equity securities previously classified as cost method investments |  |  | 36 |  | 36 |  |
Net unrealized gains on equity securities previously classified as cost method investments, after tax |  |  | 22 |  | 22 |  |
Unrealized gain (loss) on securities recorded in other income, before tax | [1] |  | 36 |  | (11) |  |
Other income |  |  | 21 | $ 13 | 24 | 44 |
Tax reform, reclassification of tax expense (benefit) from AOCI to membership interests |  |  |  |  | 3 |  |
Virginia Electric and Power Company | Retained Earnings |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net unrealized gains on equity securities previously classified as cost method investments |  |  | 3 |  | 3 |  |
Virginia Electric and Power Company | Current Regulatory Liabilities [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net unrealized gains on equity securities previously classified as cost method investments |  |  | 33 |  | 33 |  |
Virginia Electric and Power Company | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Unrealized gain (loss) on securities recorded in other income, before tax |  |  | 6 |  | (2) |  |
Unrealized gain (loss) on securities recorded in other income, net of tax |  |  | $ 5 |  | $ (2) |  |
Virginia Electric and Power Company | Previously Reported |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash provided by (used in) other investing activities |  |  |  |  |  | $ 0 |
DETI | Cumulative Effect Of Changes In Accounting Principle [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of existing contracts | Contract |  |  |  |  | 3 |  |
[1] | Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[2] | See Note 18 for amounts attributable to related parties.

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