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Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Detail) - Cash Flow Hedges - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ (29) | $ 148
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 41 | (11)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (84) | 68
Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3] | (9) | 7
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4] | (84) | 68
Dominion Energy Gas Holdings, LLC |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5] | (36) | 19
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (3) | 3
Commodity |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 66 | 97
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 57 | (7)
Commodity | Dominion Energy Gas Holdings, LLC |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5] | (1) | 4
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 2 | (3)
Commodity | Net income from discontinued operations | Dominion Energy Gas Holdings, LLC |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 2 | (3)
Commodity | Operating Revenue |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 54 | (12)
Commodity | Purchased Gas |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 3 | (2)
Commodity | Electric Fuel and Other Energy-Related Purchases |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  | 7
Interest rate |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[6] | (84) | 38
Amount of Gain (Loss) Reclassified From AOCI to Income | [6] | (10) | (12)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[6] | (84) | 68
Interest rate | Virginia Electric and Power Company |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3],[7] | (9) | 7
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4],[7] | (84) | 68
Interest rate | Dominion Energy Gas Holdings, LLC |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5],[8] | (24) | 2
Amount of Gain (Loss) Reclassified From AOCI to Income | [8] | 1 | (2)
Foreign currency |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[9] | (11) | 13
Amount of Gain (Loss) Reclassified From AOCI to Income | [9] | (6) | 8
Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5],[10] | (11) | 13
Amount of Gain (Loss) Reclassified From AOCI to Income | [10] | $ (6) | $ 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 deferred into AOCI have no associated effect in Virginia Power’s Consolidated Statements of Income.
[4] | Represents net derivative activity deferred into and amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income.
[5] | Amounts deferred into AOCI have no associated effect in Dominion Energy Gas’ Consolidated Statements of Income.
[6] | Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in interest and related charges.
[7] | Amounts recorded in Virginia Power’s Consolidated Statements of Income are classified in interest and related charges.
[8] | Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in interest and related charges.
[9] | Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in other income.
[10] | Amounts recorded in Dominion Energy Gas’ Consolidated Statements of Income are classified in other income.

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