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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
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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.

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