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Derivatives and Hedge Accounting Activities (Gains and Losses on our Derivatives in Cash Flow Hedging Relationships) (Details) - Cash Flow Hedges - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [1] $ 92 $ 184 $ 37
Amount of Gain (Loss) Reclassified from AOCI to Income 259 176 (152)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] (26) (9) (85)
Commodity      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [1] 164 230 245
Amount of Gain (Loss) Reclassified from AOCI to Income 307 187 (136)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2] 0 4 (4)
Commodity | Operating Revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI to Income 330 203 (130)
Commodity | Purchased gas      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI to Income (13) (15) (13)
Commodity | Electric Fuel and Other Energy-Related Purchases      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI to Income (10) (1) 7
Interest rate      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [1],[3] (66) (46) (208)
Amount of Gain (Loss) Reclassified from AOCI to Income [3] (31) (11) (16)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[3] (26) (13) (81)
Foreign currency      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [1],[4] (6)    
Amount of Gain (Loss) Reclassified from AOCI to Income [4] (17)    
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [2],[4] 0    
Virginia Electric and Power Company      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [5] (3) (3) (6)
Amount of Gain (Loss) Reclassified from AOCI to Income (1) (1) 5
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [6] (26) (9) (85)
Virginia Electric and Power Company | Commodity      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [5]   0 4
Amount of Gain (Loss) Reclassified from AOCI to Income   (1) 5
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [6]   4 (4)
Virginia Electric and Power Company | Commodity | Electric Fuel and Other Energy-Related Purchases      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI to Income   (1) 5
Virginia Electric and Power Company | Interest rate      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [5],[7] (3) (3) (10)
Amount of Gain (Loss) Reclassified from AOCI to Income [7] (1) 0 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment [6],[7] (26) (13) (81)
Dominion Gas Holdings, LLC      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [8] (26) 10 (50)
Amount of Gain (Loss) Reclassified from AOCI to Income (15) 6 (13)
Dominion Gas Holdings, LLC | Commodity      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [8] (12) 16 12
Amount of Gain (Loss) Reclassified from AOCI to Income 4 6 (12)
Dominion Gas Holdings, LLC | Commodity | Operating Revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI to Income 4 6 2
Dominion Gas Holdings, LLC | Commodity | Purchased gas      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from AOCI to Income     (14)
Dominion Gas Holdings, LLC | Interest rate      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [8],[9] (8) (6) (62)
Amount of Gain (Loss) Reclassified from AOCI to Income [9] (2) $ 0 $ (1)
Dominion Gas Holdings, LLC | Foreign currency      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) [8],[10] (6)    
Amount of Gain (Loss) Reclassified from AOCI to Income [10] $ (17)    
[1] Amounts deferred into AOCI have no associated effect in Dominion'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's Consolidated Statements of Income.
[3] Amounts recorded in Dominion's Consolidated Statements of Income are classified in interest and related charges.
[4] Amounts recorded in Dominion'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] 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.
[7] Amounts recorded in Virginia Power's Consolidated Statements of Income are classified in interest and related charges.
[8] Amounts deferred into AOCI have no associated effect in Dominion Gas' Consolidated Statements of Income.
[9] Amounts recorded in Dominion Gas' Consolidated Statements of Income are classified in interest and related charges.
[10] Amounts recorded in Dominion Gas' Consolidated Statements of Income are classified in other income.