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Related-Party Transactions (Narrative) (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset | $ 244,000,000 |  |  | $ 307,000,000 |
Derivative Liabilities | 90,000,000 |  |  | 284,000,000 |
Virginia Electric and Power Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset | 129,000,000 | [1] |  | 166,000,000 |
Derivative Liabilities | 23,000,000 |  |  | 66,000,000 |
Short term demand note | 11,000,000 |  |  | 33,000,000 | [2]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries | $ 0 |  |  | 0 |
Issuance of common stock (in shares) | 0 |  | 0 |  |
Virginia Electric and Power Company | Pension Benefits | Amounts Associated with the Dominion Pension Plan |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amounts due to Dominion, noncurrent | $ 537,000,000 |  |  | 505,000,000 |
Virginia Electric and Power Company | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amounts due from Dominion, noncurrent | 218,000,000 |  |  | 199,000,000 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset | 5,000,000 |  |  | 11,000,000 |
Derivative Liabilities | 7,000,000 |  |  | 5,000,000 |
Virginia Electric and Power Company | Principal Owner |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Short term demand note | 11,000,000 |  |  | 33,000,000 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset | 44,000,000 |  |  | 32,000,000 |
Derivative Liabilities | 1,000,000 |  |  | 8,000,000 |
Short term demand note | 41,000,000 |  |  | 18,000,000 | [3]
Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Short term demand note | 41,000,000 |  |  | 18,000,000 |
Dominion Energy Gas Holdings, LLC | Maximum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Derivative Asset | 1,000,000 |  |  |  |
Derivative Liabilities | 1,000,000 |  |  |  |
Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amounts due from Dominion, noncurrent | 744,000,000 |  |  | 734,000,000 |
Dominion Energy Gas Holdings, LLC | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amounts due from Dominion, noncurrent | $ 9,000,000 |  |  | $ 7,000,000 |
[1] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

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