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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.

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