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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | $ 294 | $ 307
Derivative Liabilities |  | 279 | 284
Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 93 | 166
Derivative Liabilities |  | 103 | 66
Dominion Energy Gas Holdings, LLC |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 31 | 33
Derivative Liabilities |  | 19 | 8
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 5,156 | 5,379
Total liabilities |  | 279 | 284
Fair Value, Measurements, Recurring | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 3,277 | 3,493
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 431 | 444
Fair Value, Measurements, Recurring | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 1,143 | 1,101
Fair Value, Measurements, Recurring | Cash equivalents and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 11 | 34
Fair Value, Measurements, Recurring | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 250 | 258
Derivative Liabilities |  | 135 | 197
Fair Value, Measurements, Recurring | Interest rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 18 | 17
Derivative Liabilities |  | 142 | 85
Fair Value, Measurements, Recurring | Foreign currency |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 26 | 32
Derivative Liabilities |  | 2 | 2
Fair Value, Measurements, Recurring | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 2,297 | 2,466
Total liabilities |  | 103 | 66
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] |  | 1,566
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] | 1,476 | 224
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] | 221 | 494
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Cash equivalents and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] | 507 | 16
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 90 | 166
Derivative Liabilities |  | 15 | 9
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Interest rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 3 |
Derivative Liabilities |  | 88 | 57
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 31 | 33
Total liabilities |  | 19 | 8
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 3 |
Derivative Liabilities |  |  | 6
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 2 | 1
Derivative Liabilities |  | 17 |
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 26 | 32
Derivative Liabilities |  | 2 | 2
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 3,743 | 3,834
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 3,277 | 3,493
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 455 | 307
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 11 | 34
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 1,640 | 1,750
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Equity securities: | U.S. |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] |  | 1,566
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] | 1,476 |
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] |  | 168
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Cash equivalents and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] | 164 | 16
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 1,343 | 1,388
Total liabilities |  | 273 | 277
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 431 | 444
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 688 | 794
Fair Value, Measurements, Recurring | Level 2 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 180 | 101
Derivative Liabilities |  | 129 | 190
Fair Value, Measurements, Recurring | Level 2 | Interest rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 18 | 17
Derivative Liabilities |  | 142 | 85
Fair Value, Measurements, Recurring | Level 2 | Foreign currency |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 26 | 32
Derivative Liabilities |  | 2 | 2
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 591 | 564
Total liabilities |  | 97 | 61
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] |  | 224
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Fixed Income | Government Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] | 221 | 326
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Cash equivalents and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | [2] | 343 |
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 24 | 14
Derivative Liabilities |  | 9 | 4
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Interest rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 3 |
Derivative Liabilities |  | 88 | 57
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 31 | 33
Total liabilities |  | 19 | 6
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 3 |
Derivative Liabilities |  |  | 4
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Interest rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 2 | 1
Derivative Liabilities |  | 17 |
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Foreign currency |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 26 | 32
Derivative Liabilities |  | 2 | 2
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 70 | 157
Total liabilities |  | 6 | 7
Fair Value, Measurements, Recurring | Level 3 | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 70 | 157
Derivative Liabilities |  | 6 | 7
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 66 | 152
Total liabilities |  | 6 | 5
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset |  | 66 | 152
Derivative Liabilities |  | $ 6 | 5
Fair Value, Measurements, Recurring | Level 3 | Dominion Energy Gas Holdings, LLC |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities |  |  | 2
Fair Value, Measurements, Recurring | Level 3 | Dominion Energy Gas Holdings, LLC | Commodity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liabilities |  |  | $ 2
[1] | Includes investments held in the nuclear decommissioning and rabbi trusts. Excludes $220 million and $88 million of assets at December 31, 2018 and 2017, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.
[2] | Includes investments held in the nuclear decommissioning trusts. Excludes $160 million and $27 million of assets at December 31, 2018 and 2017, respectively, measured at fair value using NAV (or its equivalent) as a practical expedient which are not required to be categorized in the fair value hierarchy.

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