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Equity (Narrative) (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Aug. 15, 2016 shares | [1] | Jul. 01, 2016 shares | Apr. 01, 2016 shares | Jul. 01, 2014 shares | Jan. 31, 2017 USD ($) shares | Jul. 31, 2016 shares | Apr. 30, 2016 USD ($) shares | Dec. 31, 2014 USD ($) agreement | Dec. 31, 2016 USD ($) shares | Dec. 31, 2017 performance_metric | Dec. 31, 2016 USD ($) performance_metric shares | Dec. 31, 2015 USD ($) performance_metric shares | Dec. 31, 2014 USD ($) | Dec. 31, 2007 | Jan. 31, 2016 USD ($) | Sep. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 2,152,000,000 | $ 786,000,000 | $ 205,000,000 |  |  |
Common stock, shares outstanding | shares |  |  |  |  |  |  |  |  | 628,000,000 |  | 628,000,000 | 596,000,000 |  |  |  |
Net proceeds from issuance of Dominion Midstream common units |  |  |  |  |  |  |  |  |  |  | $ 482,000,000 | $ 0 | 392,000,000 |  |  |
Net proceeds from issuance of Dominion Midstream convertible preferred units |  |  |  |  |  |  |  |  |  |  | 490,000,000 | 0 | 0 |  |  |
Compensation cost related to stock-based compensation |  |  |  |  |  |  |  |  |  |  | 33,000,000 | 39,000,000 | 39,000,000 |  |  |
Tax benefit from stock awards and stock options exercised |  |  |  |  |  |  |  |  |  |  | 11,000,000 | 14,000,000 | 14,000,000 |  |  |
Tax benefits from the vesting of restricted stock awards (less than $1 million) |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 3,000,000 | 1,000,000 |  |  |
Cash-Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash-based performance grants minimum percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |
Cash-based performance grants maximum percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |
February 2014 Awards | Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected award under grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
Number of performance metrics achieved | performance_metric |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
February 2015 Cash Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of performance metrics achieved | performance_metric |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
February 2015 Cash Based Performance Grant | Officer | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected award under grant |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |
February 2016 Cash Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant |  |  |  |  |  |  |  |  | $ 14,000,000 |  | $ 14,000,000 |  |  |  |  |
Liability accrued for award |  |  |  |  |  |  |  |  | $ 6,000,000 |  | $ 6,000,000 |  |  |  |  |
February 2016 Cash Based Performance Grant | Officer | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of performance metrics achieved | performance_metric |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Dominion Direct, Employee Stock Awards, Employee Savings Plans, Director Stock Compensation Plans, and Contingent Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved and available for issuance | shares |  |  |  |  |  |  |  |  | 63,000,000 |  | 63,000,000 |  |  |  |  |
Stock-Based Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares were available for future grants | shares |  |  |  |  |  |  |  |  | 24,000,000 |  | 24,000,000 |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Unrecognized compensation cost related to nonvested awards |  |  |  |  |  |  |  |  | $ 31,000,000 |  | $ 31,000,000 |  |  |  |  |
Fair value of restricted stock awards that vested |  |  |  |  |  |  |  |  |  |  | $ 21,000,000 | $ 37,000,000 | $ 19,000,000 |  |  |
Goal-Based Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of performance metrics | performance_metric |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Performance metrics period |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Shares issued minimum percentage |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Shares issued maximum percentage |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |
Targeted shares expected to be issued | shares |  |  |  |  |  |  |  |  | 23,000 |  | 23,000 |  |  |  |  |
Goal-Based Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted to one class to another | shares |  |  |  |  | 9,000 |  |  |  |  |  |  |  |  |  |  |
Dominion Midstream Limited Partner Common Unit Purchase Program | Limited partner interest in Dominion Midstream | Dominion Midstream Partners, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized purchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000
Number of common units purchased | shares |  |  |  |  |  |  |  |  |  |  | 658,000 | 887,000 |  |  |  |
Value of common units purchased |  |  |  |  |  |  |  |  |  |  | $ 17,000,000 | $ 25,000,000 |  |  |  |
Maximum | Stock-Based Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum term of stock based awards |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |
Weighted Average | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected weighted-average period recognized for the unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |
Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares | 28,000,000 |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit, Class A | Remarketable Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |
Number of shares issued | shares |  | 8,500,000.0 | 8,500,000.0 |  |  | 8,500,000.0 | 8,500,000.0 |  |  |  |  |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 2,200,000,000 |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  |  |  |  |  |  | 32,000,000 |  |  |  |  |
Common stock, shares outstanding | shares |  |  |  |  |  |  |  |  | 628,000,000 |  | 628,000,000 |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds received from issuance of shares through Dominion Direct and employee savings plans |  |  |  |  |  |  |  |  |  |  | $ 295,000,000 |  |  |  |  |
Number of shares issued through Dominion Direct and employee savings plans | shares |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |
Shelf Registration for Sale of Common Stock through At-the-market Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sales agency agreements | agreement |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Shelf Registration for Sale of Common Stock through At-the-market Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of common stock in which Dominion may offer under sales agency agreements |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Common stock reserved for issuance in connection with stock purchase contracts |  |  |  |  |  |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |
Underwritten Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | $ 756,000,000 |  |  |  |  |  |  |  |  |
Number of shares issued in offering | shares |  |  |  |  |  |  | 10,200,000 |  |  |  |  |  |  |  |  |
Dominion Midstream Partners, LP | Limited partner interest in Dominion Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of Dominion Midstream common units |  |  |  |  |  |  |  |  | $ 482,000,000 |  |  |  |  |  |  |
Conversion basis |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |
Dominion Midstream Partners, LP | Limited partner interest in Dominion Midstream | Convertible Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of Dominion Midstream convertible preferred units |  |  |  |  |  |  |  |  | $ 490,000,000 |  |  |  |  |  |  |
[1] | The maturity dates of the $700 million Series A-1 RSNs and $700 million Series A-2 RSNs are August 15, 2021 and August 15, 2024, respectively.

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