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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 | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1] | $ 40 |  | $ 11 | $ 92
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (137) |  | 47 | 259
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 39 |  | (58) | (26)
Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [3] | 2 |  | (8) | (3)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (1) |  | (1) | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4] | 39 |  | (58) | (26)
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) |  | (23) |  | 8 | (26)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (27) |  | 7 | (15)
Commodity |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1] | 64 |  | 1 | 164
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (76) |  | 79 | 307
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) | (12)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (8) |  | (8) | 4
Commodity | Operating Revenue |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (90) |  | 81 | 330
Commodity | Operating Revenue | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (8) |  | (8) | 4
Commodity | Electric fuel and other energy-related purchases |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 14 |  |  | (10)
Commodity | Purchased Gas |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  | (2) | (13)
Interest rate |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1],[5] | (18) | [6] | (8) | (66)
Amount of Gain (Loss) Reclassified From AOCI to Income | [5] | (48) | [6] | (52) | (31)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[5] | 39 | [6] | (58) | (26)
Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [3],[7] | 2 |  | (8) | (3)
Amount of Gain (Loss) Reclassified From AOCI to Income | [7] | (1) |  | (1) | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4],[7] | 39 |  | (58) | (26)
Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) |  | (18) |  |  | (8)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (6) |  | (5) | (2)
Foreign currency |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1],[8] | (6) |  | 18 | (6)
Amount of Gain (Loss) Reclassified From AOCI to Income | [8] | (13) |  | 20 | (17)
Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) |  | (6) |  | 18 | (6)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | $ (13) |  | $ 20 | $ (17)
[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 recorded in Dominion Energy's Consolidated Statements of Income are classified in interest and related charges.
[6] | See Note 9 for amounts attributable to related parties.
[7] | Amounts recorded in Virginia Power's Consolidated Statements of Income are classified in interest and related charges.
[8] | Amounts recorded in Dominion Energy's Consolidated Statements of Income are classified in other income.

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