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Related-Party Transactions (Narrative) (Detail) - USD ($)
shares in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Dec. 31, 2018

Related Party Transaction [Line Items]

Derivative Asset

$ 173,000,000

$ 294,000,000

Derivative Liabilities

369,000,000

279,000,000

Virginia Electric and Power Company

Related Party Transaction [Line Items]

Derivative Asset

66,000,000

93,000,000

Derivative Liabilities

190,000,000

103,000,000

Short term demand note

24,000,000

224,000,000

^[1]

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

$ 661,000,000

632,000,000

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

265,000,000

254,000,000

Virginia Electric and Power Company | Affiliated Entity

Related Party Transaction [Line Items]

Derivative Asset

6,000,000

26,000,000

Derivative Liabilities

6,000,000

10,000,000

Virginia Electric and Power Company | Principal Owner

Related Party Transaction [Line Items]

Short term demand note

24,000,000

224,000,000

Dominion Energy Gas Holdings, LLC

Related Party Transaction [Line Items]

Derivative Asset

13,000,000

29,000,000

Derivative Liabilities

42,000,000

19,000,000

Short term demand note

47,000,000

218,000,000

^[2]

Dominion Energy Gas Holdings, LLC | Revolving Credit Facility | IRCA

Related Party Transaction [Line Items]

Short term demand note

47,000,000

218,000,000

Dominion Energy Gas Holdings, LLC | Pension Benefits | Amounts Associated with the Dominion Pension Plan

Related Party Transaction [Line Items]

Amounts due from Dominion, noncurrent

782,000,000

772,000,000

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

$ 15,000,000

$ 14,000,000

[1]	Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2]	Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

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