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

1 Months Ended

3 Months Ended

9 Months Ended

Aug. 31, 2019

Sep. 30, 2019

Sep. 30, 2018

Sep. 30, 2019

Sep. 30, 2018

Dec. 31, 2018

Related Party Transaction [Line Items]

Derivative Asset

$ 93,000,000

$ 93,000,000

$ 294,000,000

Derivative Liabilities

934,000,000

934,000,000

279,000,000

Issuance of common stock to Dominion

18.5

Virginia Electric and Power Company

Related Party Transaction [Line Items]

Derivative Asset

20,000,000

20,000,000

93,000,000

Derivative Liabilities

554,000,000

554,000,000

103,000,000

Short term demand note

9,000,000

9,000,000

224,000,000

^[1]

Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries

$ 0

$ 0

0

Issuance of common stock to Dominion

0.0

0.0

0.0

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

$ 750,000,000

$ 750,000,000

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

272,000,000

272,000,000

254,000,000

Virginia Electric and Power Company | Affiliated Entity

Related Party Transaction [Line Items]

Derivative Asset

3,000,000

3,000,000

26,000,000

Derivative Liabilities

18,000,000

18,000,000

10,000,000

Virginia Electric and Power Company | Principal Owner

Related Party Transaction [Line Items]

Short term demand note

9,000,000

9,000,000

224,000,000

Dominion Energy Gas Holdings, LLC

Related Party Transaction [Line Items]

Derivative Asset

5,000,000

5,000,000

29,000,000

Derivative Liabilities

117,000,000

117,000,000

19,000,000

Short term demand note

160,000,000

160,000,000

218,000,000

^[2]

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

Related Party Transaction [Line Items]

Short term demand note

160,000,000

160,000,000

218,000,000

Interest charges

2,000,000

Dominion Energy Gas Holdings, LLC | Maximum [Member] | Revolving Credit Facility | IRCA

Related Party Transaction [Line Items]

Interest charges

1,000,000

$ 1,000,000

$ 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

793,000,000

793,000,000

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

$ 16,000,000

$ 16,000,000

$ 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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