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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ (105) | $ (44) | $ (134) | $ 104
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 29 | (44) | 70 | (55)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (131) | 25 | (215) | 93
Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3] | (15) | 2 | (24) | 9
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (1) |  | (1) |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4] | (133) | 25 | (218) | 93
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5] | (32) | (27) | (68) | (8)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 2 | (18) | (1) | (15)
Commodity |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 35 | (39) | 101 | 58
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 38 | (16) | 95 | (23)
Commodity | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5] | 3 | (10) | 2 | (6)
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  | (2) | 2 | (5)
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) | 2 | (5)
Commodity | Operating Revenue |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 38 | (16) | 92 | (28)
Commodity | Electric Fuel and Other Energy-Related Purchases |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  | 7
Commodity | Purchased Gas |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  | 3 | (2)
Interest rate |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[6] | (142) | 9 | (226) | 47
Amount of Gain (Loss) Reclassified From AOCI to Income | [6] | (13) | (12) | (23) | (24)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (131) | 25 | (215) | 93
Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3],[7] | (15) | 2 | (24) | 9
Amount of Gain (Loss) Reclassified From AOCI to Income | [7] | (1) |  | (1) |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4],[7] | (133) | 25 | (218) | 93
Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5],[8] | (36) | (3) | (60) | (1)
Amount of Gain (Loss) Reclassified From AOCI to Income | [8] | (2) |  | (1) | (2)
Foreign currency |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[9] | 2 | (14) | (9) | (1)
Amount of Gain (Loss) Reclassified From AOCI to Income | [9] | 4 | (16) | (2) | (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] | 1 | (14) | (10) | (1)
Amount of Gain (Loss) Reclassified From AOCI to Income | [10] | $ 4 | $ (16) | $ (2) | $ (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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