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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | $ 14 | $ (144) | $ (339) | $ (278)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (251) | 7 | (287) | 77
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 62 | (190) | (488) | (405)
Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3] | 6 | (21) | (53) | (45)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (1) | 0 | (2) | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4] | 60 | (190) | (492) | (408)
Commodity |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 0 | (5) | 0 | 96
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 8 | 33 | 21 | 128
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 0 | 0 | 0 | 0
Commodity | Operating Revenue |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 8 | 34 | 22 | 123
Commodity | Purchased Gas |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  | (2) | (3) | 1
Commodity | Discontinued operations |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] |  | 0 | 0 | 0
Amount of Gain (Loss) Reclassified From AOCI to Income |  |  | 1 | 2 | 4
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] |  | 0 | 0 | 0
Interest rate |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 8 | (124) | (328) | (350)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (253) | (14) | (302) | (37)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 62 | (190) | (488) | (405)
Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [3],[5] | 6 | (21) | (53) | (45)
Amount of Gain (Loss) Reclassified From AOCI to Income | [5] | (1) | 0 | (2) | (1)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [4],[5] | 60 | (190) | (492) | (408)
Interest rate | Interest and Related Charges |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 0 | 0 | 0 | 0
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (23) | (12) | (66) | (35)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 0 | 0 | 0 | 0
Interest rate | Discontinued operations |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1] | 0 | 0 | 0 | 0
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (230) | (2) | (236) | (2)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 0 | 0 | 0 | 0
Foreign currency |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | [1],[6] | 6 | (15) | (11) | (24)
Amount of Gain (Loss) Reclassified From AOCI to Income | [6] | (6) | (12) | (6) | (14)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[6] | $ 0 | $ 0 | $ 0 | $ 0
[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 Virginia Power’s Consolidated Statements of Income are classified in interest and related charges.
[6] | Amounts recorded in Dominion Energy’s Consolidated Statements of Income are classified in discontinued operations.

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