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Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (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 AOCI on Derivatives (Effective Portion)

^[1]

$ (145)

$ 40

$ 11

Amount of Gain (Loss) Reclassified From AOCI to Income

83

(137)

47

Increase (Decrease) in Derivatives Subject to Regulatory Treatment

(255)

39

^[2]

(58)

^[2]

Commodity

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

^[1]

125

64

1

Amount of Gain (Loss) Reclassified From AOCI to Income

143

(76)

79

Commodity | Operating Revenue

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Reclassified From AOCI to Income

146

(90)

81

Commodity | Purchased Gas

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Reclassified From AOCI to Income

(3)

14

(2)

Interest rate

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

^[1],[3]

(252)

(18)

(8)

Amount of Gain (Loss) Reclassified From AOCI to Income

(54)

(48)

(52)

Increase (Decrease) in Derivatives Subject to Regulatory Treatment

^[2]

(255)

^[4]

39

^[3]

(58)

^[3]

Foreign currency

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

^[1]

(18)

^[4]

6

^[3]

18

^[4]

Amount of Gain (Loss) Reclassified From AOCI to Income

(6)

(13)

20

Cash Flow Hedges | Virginia Electric and Power Company

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

(30)

2

(8)

Amount of Gain (Loss) Reclassified From AOCI to Income

(1)

(1)

(1)

Increase (Decrease) in Derivatives Subject to Regulatory Treatment

(259)

39

(58)

Cash Flow Hedges | Dominion Energy Gas Holdings, LLC

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

85

21

9

Amount of Gain (Loss) Reclassified From AOCI to Income

(7)

26

6

Cash Flow Hedges | Commodity | Dominion Energy Gas Holdings, LLC

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

1

10

Amount of Gain (Loss) Reclassified From AOCI to Income

4

(8)

8

Cash Flow Hedges | Interest rate | Virginia Electric and Power Company

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

^[5],[6]

(30)

2

(8)

Amount of Gain (Loss) Reclassified From AOCI to Income

(1)

(1)

(1)

Increase (Decrease) in Derivatives Subject to Regulatory Treatment

^[5],[6]

(259)

39

(58)

Cash Flow Hedges | Interest rate | Dominion Energy Gas Holdings, LLC

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

^[7],[8]

(68)

(16)

1

Amount of Gain (Loss) Reclassified From AOCI to Income

^[7],[8]

(5)

(5)

(6)

Cash Flow Hedges | Foreign currency | Dominion Energy Gas Holdings, LLC

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)

^[7],[9]

(18)

(6)

18

Amount of Gain (Loss) Reclassified From AOCI to Income

^[7],[9]

(6)

(13)

20

Cash Flow Hedges | Net income from discontinued operations | Commodity | Dominion Energy Gas Holdings, LLC

Derivative Instruments Gain Loss [Line Items]

Amount of Gain (Loss) Reclassified From AOCI to Income

$ 4

$ 8

$ 8

[1]	Amounts deferred into AOCI have no associated effect in Dominion Energy’s Consolidated Statements of Income.
[2]	Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income.
[3]	Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges.
[4]	Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income.
[5]	Amounts deferred into AOCI have no associated effect in Virginia Power’s Consolidated Statements of Income.
[6]	Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in interest and related charges.
[7]	Amounts deferred into AOCI have no associated effect in Dominion Energy Gas’ Consolidated Statements of Income.
[8]	Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in interest and related charges.
[9]	Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in other income.

X

- Definition

The increase (decrease) (net) in instruments designated and qualifying as hedging instruments subject to regulatory treatment.

+ References

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
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Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

+ References

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-Paragraph 4C
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