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Related-Party Transactions (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  | $ 1,103 | $ 1,435 |
Virginia Electric and Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Commodity purchases from affiliates |  | 398 | 212 |
Services provided by affiliates | [1] | 120 | 112 |
Capital expenditures |  | 570 | 647 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Sales of natural gas and transportation and storage services to affiliates and Services provided to related parties |  | 6 | 5 |
Virginia Electric and Power Company | Affiliated Entity | Services provided by affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  | 37 | 34 |
Dominion Energy Gas Holdings, LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Commodity purchases from affiliates |  | 3 |  |
Sales of natural gas and transportation and storage services to affiliates and Services provided to related parties | [2] | 52 | 39 |
Capital expenditures |  | 138 | 134 |
Other receivables | [3] | 17 |  | $ 12
Customer receivables from related parties |  |  |  | 1
Affiliated notes receivable | [4] | 19 |  | 20
Dominion Energy Gas Holdings, LLC | Services provided by affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Services provided by affiliates | [5] | 33 | 35 |
Dominion Energy Gas Holdings, LLC | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Sales of natural gas and transportation and storage services to affiliates and Services provided to related parties |  | 18 | 18 |
Imbalances receivable from affiliates |  |  |  | $ 1
Dominion Energy Gas Holdings, LLC | Affiliated Entity | Services provided by affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  | $ 10 | $ 8 |
[1] | Includes capitalized expenditures of $37 million and $34 million for the three months ended March 31, 2018 and 2017, respectively.
[2] | Amounts primarily attributable to Atlantic Coast Pipeline, a related-party VIE.
[3] | Represents amounts due from Atlantic Coast Pipeline, a related-party VIE.
[4] | Amounts are presented in other deferred charges and other assets in Dominion Energy Gas' Consolidated Balance Sheets.
[5] | Includes capitalized expenditures of $10 million and $8 million for the three months ended March 31, 2018 and 2017, respectively.

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