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Significant Accounting Policies (Narrative) (Detail) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) Contract $ / shares | Mar. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Payments for sales and services due period |  | 1 month |
Cash provided by other investing activities |  | $ 4 | $ 4
Operating Revenue | [1] | 3,466 | 3,384
Other energy-related purchases |  | 744 | 575
Purchased gas |  | 340 | 305
Unrealized gains reclassified from AOCI to retained earnings |  | 1,100 |
Unrealized gains reclassified from AOCI to retained earnings after-tax |  | 734 |
Unrealized gain (loss) on securities recorded in other income, before tax | [2] | $ (84) |
Loss per share from unrealized lLoss on securities | $ / shares |  | $ 0.06 |
Other operations and maintenance |  | $ 796 | 784
Other income |  | 100 | 162
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
Other energy-related purchases |  | 25 | 0
Accounting Standards Update 2014-09 [Member] | Transportation And Storage Arrangements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Operating Revenue |  |  | (32)
Purchased gas |  |  | (32)
Accounting Standards Update 2016-01 [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Unrealized gain (loss) on securities recorded in other income, before tax |  | (47) |
Unrealized gain (loss) on securities recorded in other income, net of tax |  | (38) |
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 |
Cumulative Effect Of Changes In Accounting Principle [Member] | Accounting Standards Update201705 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Change in accounting principle to retained earnings and membership interest |  | $ 127 |
Previously Reported |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash provided by other investing activities |  |  | 11
Other operations and maintenance |  |  | 738
Other income |  |  | 116
Merchant Solar Projects | Terra Nova Renewable Partners |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  | 33.00% |
Merchant Solar Projects | Terra Nova Renewable Partners | Call Option |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage ownership in total units |  | 67.00% |
Four Brothers and Three Cedars |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage ownership in total units |  | 50.00% |
Dominion Energy Midstream Partners, LP | Common and Subordinated Units |  |  |
Significant Accounting Policies [Line Items] |  |  |
Ownership interest percentage of limited partner interests |  | 50.50% |
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% |
Virginia Electric and Power Company |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash provided by other investing activities |  | $ (6) | (3)
Operating Revenue | [3] | 1,748 | 1,831
Other energy-related purchases | [3] | 591 | 456
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 |
Net unrealized gains on equity securities previously classified as cost method investments, after tax |  | 22 |
Unrealized gain (loss) on securities recorded in other income, before tax | [2] | (47) |
Other income |  | 3 | 31
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 |
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 |
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 |  | (8) |
Unrealized gain (loss) on securities recorded in other income, net of tax |  | (6) |
Virginia Electric and Power Company | Previously Reported |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash provided by other investing activities |  |  | 0
Dominion Energy Gas Holdings, LLC |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash provided by other investing activities |  | (5) | (8)
Operating Revenue | [4] | 526 | 490
Purchased gas | [4] | 29 | 43
Other income |  | 33 | 25
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
Other energy-related purchases |  | 25 | 0
Dominion Energy Gas Holdings, LLC | Accounting Standards Update 2014-09 [Member] | Transportation And Storage Arrangements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Operating Revenue |  |  | (24)
Purchased gas |  |  | (24)
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 |
Dominion Energy Gas Holdings, LLC | Previously Reported |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash provided by other investing activities |  |  | 0
Other operations and maintenance |  |  | 133
Other income |  |  | $ 5
DETI | Cumulative Effect Of Changes In Accounting Principle [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Number of existing contracts | Contract |  | 3 |
[1] | See Note 10 for amounts attributable to related parties.
[2] | Included in other income and the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[3] | See Note 18 for amounts attributable to affiliates.
[4] | See Note 18 for amounts attributable to related parties.

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