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Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Details) - Cash Flow Hedges - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1] | $ 70 | $ 86
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 37 | 102
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 8 | (133)
Commodity |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1] | 87 | 173
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 62 | 105
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2] | 0 | 0
Commodity | Operating revenue |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 62 | 114
Commodity | Purchased gas |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 1 | (6)
Commodity | Electric fuel and other energy-related purchases |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (1) | (3)
Interest rate |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1],[3] | 1 | (87)
Amount of Gain (Loss) Reclassified From AOCI to Income | [3] | (11) | (3)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [2],[3] | 8 | (133)
Foreign currency |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [1],[4] | (18) |
Amount of Gain (Loss) Reclassified From AOCI to Income | [4] | (14) |
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] | 0 | (14)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | 0 | 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [6] | 8 | (133)
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] | 0 | (14)
Amount of Gain (Loss) Reclassified From AOCI to Income | [7] | 0 | 0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment | [6],[7] | 8 | (133)
Dominion Gas Holdings, LLC |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [8] | (16) | (10)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (18) | 4
Dominion Gas Holdings, LLC | Commodity |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) | [8] | 2 | (1)
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (3) | 4
Dominion Gas Holdings, LLC | Commodity | Operating revenue |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified From AOCI to Income |  | (3) | 4
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] | 0 | (9)
Amount of Gain (Loss) Reclassified From AOCI to Income | [9] | (1) | $ 0
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] | (18) |
Amount of Gain (Loss) Reclassified From AOCI to Income | [10] | $ (14) |
[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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