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Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

$ (26)

$ (26)

$ (45)

Derivatives Not Designated as Hedging Instruments | Virginia Electric and Power Company

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

(45)

2

(57)

^[1]

Derivatives Not Designated as Hedging Instruments | Dominion Energy Gas Holdings, LLC

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

(11)

Derivatives Not Designated as Hedging Instruments | Commodity | Virginia Electric and Power Company

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

^[2]

(45)

2

(57)

^[1]

Derivatives Not Designated as Hedging Instruments | Commodity | Operating Revenue

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

45

(28)

18

Derivatives Not Designated as Hedging Instruments | Commodity | Operating Revenue | Dominion Energy Gas Holdings, LLC

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

(11)

Derivatives Not Designated as Hedging Instruments | Commodity | Purchased Gas

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

(28)

11

(3)

Derivatives Not Designated as Hedging Instruments | Commodity | Electric Fuel and Other Energy-Related Purchases

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

(46)

(9)

(59)

Derivatives Not Designated as Hedging Instruments | Commodity | Other operations and maintenance

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

0

$ 0

$ (1)

Derivatives Not Designated as Hedging Instruments | Commodity | Interest rate

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in Income on Derivatives

$ 3

[1]	Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income.
[2]	Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in electric fuel and other energy-related purchases.

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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+ References

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