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Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Regulated gas transportation and storage: |  |  |
Total operating revenue | [1] | $ 3,466 | $ 3,384
Subsequent To Adoption of Revised Guidance |  |  |
Regulated electric sales: |  |  |
Nonregulated electric sales |  | 418 |
Regulated gas sales: |  |  |
Nonregulated gas sales |  | 88 |
Regulated gas transportation and storage: |  |  |
Other regulated revenues |  | 50 |
Other nonregulated revenues | [2],[3] | 136 |
Total operating revenue from contracts with customers |  | 3,324 |
Other revenues |  | 142 |
Total operating revenue |  | 3,466 |
Subsequent To Adoption of Revised Guidance | FERC-regulated |  |  |
Regulated gas transportation and storage: |  |  |
Regulated gas transportation and storage |  | 262 |
Subsequent To Adoption of Revised Guidance | State-regulated |  |  |
Regulated gas transportation and storage: |  |  |
Regulated gas transportation and storage |  | 190 |
Subsequent To Adoption of Revised Guidance | Residential |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 817 |
Regulated gas sales: |  |  |
Regulated gas sales |  | 364 |
Subsequent To Adoption of Revised Guidance | Commercial |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 524 |
Regulated gas sales: |  |  |
Regulated gas sales |  | 103 |
Subsequent To Adoption of Revised Guidance | Industrial |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 107 |
Subsequent To Adoption of Revised Guidance | Government and Other Retail |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 213 |
Subsequent To Adoption of Revised Guidance | Wholesale |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 42 |
Subsequent To Adoption of Revised Guidance | Other |  |  |
Regulated gas sales: |  |  |
Regulated gas sales |  | 10 |
Virginia Electric and Power Company |  |  |
Regulated gas transportation and storage: |  |  |
Total operating revenue | [4] | 1,748 | 1,831
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance |  |  |
Regulated gas transportation and storage: |  |  |
Other regulated revenues |  | 32 |
Other nonregulated revenues | [3] | 13 |
Total operating revenue from contracts with customers |  | 1,748 |
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Residential |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 817 |
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Commercial |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 524 |
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Industrial |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 107 |
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Government and Other Retail |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 213 |
Virginia Electric and Power Company | Subsequent To Adoption of Revised Guidance | Wholesale |  |  |
Regulated electric sales: |  |  |
Regulated electric sales |  | 42 |
Dominion Energy Gas Holdings, LLC |  |  |
Regulated gas transportation and storage: |  |  |
Total operating revenue | [5] | 526 | $ 490
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance |  |  |
Regulated gas sales: |  |  |
Nonregulated gas sales | [3] | 2 |
Regulated gas transportation and storage: |  |  |
NGL revenue | [2],[3] | 54 |
Management service revenue | [3] | 47 |
Other regulated revenues | [3] | 8 |
Other nonregulated revenues | [3] | 2 |
Total operating revenue from contracts with customers |  | 528 |
Other revenues | [3] | (2) |
Total operating revenue |  | 526 |
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | FERC-regulated |  |  |
Regulated gas transportation and storage: |  |  |
Regulated gas transportation and storage | [3] | 199 |
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | State-regulated |  |  |
Regulated gas transportation and storage: |  |  |
Regulated gas transportation and storage | [3] | 180 |
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | Residential |  |  |
Regulated gas sales: |  |  |
Regulated gas sales |  | 29 |
Dominion Energy Gas Holdings, LLC | Subsequent To Adoption of Revised Guidance | Other |  |  |
Regulated gas sales: |  |  |
Regulated gas sales |  | $ 7 |
[1] | See Note 10 for amounts attributable to related parties.
[2] | Amounts above include $30 million and $26 million of NGL sales at Dominion Energy and Dominion Energy Gas, respectively, which are considered to be goods transferred at a point in time.
[3] | See Notes 10 and 18 for amounts attributable to related parties and affiliates.
[4] | See Note 18 for amounts attributable to affiliates.
[5] | See Note 18 for amounts attributable to related parties.

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