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Related-Party Transactions (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Virginia Electric and Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Commodity purchases from affiliates |  | $ 674 | $ 571 | $ 555
Services provided by affiliates | [1] | 453 | 454 | 422
Virginia Electric and Power Company | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Services provided to related parties |  | 25 | 22 | 22
Dominion Energy Gas Holdings, LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Services provided to related parties | [2] | 156 | 128 | 101
Commodity purchases from affiliates |  | 5 | 9 | 10
Services provided by affiliates | [3] | 143 | 141 | 133
Other receivables | [4] | 12 | 10 |
Customer receivables from related parties |  | 1 | 1 |
Affiliated notes receivable | [5] | 20 | 18 |
Dominion Energy Gas Holdings, LLC | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Services provided to related parties |  | 70 | 69 | $ 69
Imbalances receivable from affiliates |  | $ 1 | 2 |
Imbalances payable to affiliates | [6] |  | $ 4 |
[1] | Includes capitalized expenditures of $144 million, $144 million and $143 million for the year ended December 31, 2017, 2016 and 2015, respectively.
[2] | Amounts primarily attributable to Atlantic Coast Pipeline.
[3] | Includes capitalized expenditures of $45 million, $49 million and $57 million for the year ended December 31, 2017, 2016 and 2015, respectively.
[4] | Represents amounts due from Atlantic Coast Pipeline, a related party VIE.
[5] | Amounts are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets.
[6] | Amounts are presented in other current liabilities in Dominion Energy Gas' Consolidated Balance Sheets.

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