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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.