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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ (144) | $ (36) | $ (278) | $ 68
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 7 | (40) | 77 | (95)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | (190) | 48 | (405) | 141
Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3] | (21) | 4 | (45) | 13
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  | (1) |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4] | (190) | 48 | (408) | 141
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5] | (49) | 6 | (117) | (3)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (12) | (6) | (13) | (21)
Commodity |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | (5) | (58) | 96 | (1)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 33 | (26) | 128 | (49)
Commodity | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5] | 1 | (5) | 3 | (11)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 2 | (3) | 4 | (8)
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) | 4 | (8)
Commodity | Operating Revenue |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 35 | (26) | 127 | (55)
Commodity | Purchased Gas |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (2) |  | 1 | (2)
Commodity | Electric Fuel and Other Energy-Related Purchases |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  |  | 8
Interest rate |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [6] | (124) | 23 | (350) | 70
Amount of Gain (Loss) Reclassified From AOCI to Income | [6] | (14) | (12) | (37) | (36)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [6] | (190) | 48 | (405) | 141
Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3],[7] | (21) | 4 | (45) | 13
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  |  | (1) |
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4],[7] | (190) | 48 | (408) | 141
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) | 12 | (96) | 9
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (2) | (1) | (3) | (3)
Foreign currency |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [9] | (15) | (1) | (24) | (1)
Amount of Gain (Loss) Reclassified From AOCI to Income | [9] | (12) | (2) | (14) | (10)
Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [5],[10] | (14) | (1) | (24) | (1)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | $ (12) | $ (2) | $ (14) | $ (10)
[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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