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Equity (Narrative) (Detail) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 15, 2016 shares | [1] | Jan. 31, 2018 USD ($) shares | Jul. 31, 2017 USD ($) shares | Jun. 30, 2017 USD ($) Agreement | Jul. 31, 2016 shares | Apr. 30, 2016 USD ($) shares | Feb. 28, 2015 USD ($) | Dec. 31, 2018 Performance_Factor shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) Performance_Factor shares | Dec. 31, 2015 USD ($) shares | Sep. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | $ 1,302,000,000 | $ 2,152,000,000 | $ 786,000,000 |
Common stock, shares outstanding | shares |  |  |  |  |  |  |  |  | 645,000,000 | 628,000,000 |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  | $ 1,302,000,000 | $ 2,152,000,000 | 786,000,000 |
Net proceeds from issuance of Dominion Midstream common units |  |  |  |  |  |  |  |  | $ 18,000,000 | 482,000,000 |  |
Net proceeds from issuance of Dominion Midstream convertible preferred units |  |  |  |  |  |  |  |  |  | 490,000,000 |  |
Conversion basis |  |  |  |  |  |  |  |  | 1 |  |  |
Compensation cost related to stock-based compensation |  |  |  |  |  |  |  |  | $ 45,000,000 | 33,000,000 | 39,000,000 |
Tax benefit from stock awards and stock options exercised |  |  |  |  |  |  |  |  | $ 16,000,000 | $ 11,000,000 | 14,000,000 |
Vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
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 2015 Cash Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of performance metrics achieved | Performance_Factor |  |  |  |  |  |  |  |  |  | 2 |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Number of performance metrics achieved | Performance_Factor |  |  |  |  |  |  |  |  |  | 2 |  |
Subsequent Event | February 2016 Cash Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expected award under grant |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | February 2017 Cash Based Performance Grant [Member] | Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of performance metrics achieved | Performance_Factor |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | 67,000,000 |  |  |
Stock Based Awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares were available for future grants | shares |  |  |  |  |  |  |  |  | 23,000,000 |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to nonvested awards |  |  |  |  |  |  |  |  | $ 42,000,000 |  |  |
Fair value of restricted stock awards that vested |  |  |  |  |  |  |  |  | $ 21,000,000 | $ 21,000,000 | $ 37,000,000 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares | shares |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Common stock, shares outstanding | shares |  |  |  |  |  |  |  |  | 274,723 | 274,723 |  |
Repurchase of common stock, shares | shares |  |  |  |  |  |  |  |  | 0 | 0 |  |
Virginia Electric and Power Company | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, shares | shares |  |  |  |  |  |  |  | 0 |  |  |  |
Dominion Midstream Partners, LP | Limited Partner |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of Dominion Midstream common units |  |  |  |  |  |  |  |  | $ 18,000,000 | $ 482,000,000 |  |
Dominion Midstream Partners, LP | Limited Partner | 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 |  |
Dominion Midstream Partners, LP | Dominion Midstream Limited Partner Common Unit Purchase Program | Limited Partner |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized purchase amount |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000
Stock repurchase program expiration date |  |  |  |  |  |  |  |  | Sep. 30, 2016 |  |  |
Number of common units purchased | shares |  |  |  |  |  |  |  |  |  | 658,000 | 887,000 |
Value of common units purchased |  |  |  |  |  |  |  |  |  | $ 17,000,000 | $ 25,000,000 |
Two-year grant | February 2017 Cash Based Performance Grant [Member] | Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |
Liability accrued for award |  |  |  |  |  |  |  |  | 7,000,000 |  |  |
Three-year grant | February 2017 Cash Based Performance Grant [Member] | Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant |  |  |  |  |  |  |  |  | 15,000,000 |  |  |
Liability accrued for award |  |  |  |  |  |  |  |  | 5,000,000 |  |  |
Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares | shares | 28,000,000 |  | 12,500,000 |  |  |  |  |  |  |  |  |
Capital Unit, Class A | Remarketable Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |
Issuance of common stock (in shares | shares |  |  | 12,500,000 |  | 8,500,000 | 8,500,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 2 years |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |
Issuance of common stock (in shares | shares |  |  |  |  |  |  |  |  | 17,000,000 |  |  |
Common stock, shares outstanding | shares |  |  |  |  |  |  |  |  | 645,000,000 |  |  |
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 |  |  |  |  |  |  |  |  | $ 302,000,000 |  |  |
Number of shares issued through Dominion Direct and employee savings plans | shares |  |  |  |  |  |  |  |  | 3,800,000 |  |  |
Underwritten Public Offering |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 756,000,000 |  |  |  |  |  |
Issuance of common stock (in shares | shares |  |  |  |  |  | 10,200,000 |  |  |  |  |  |
Shelf Registration for Sale of Common Stock through At-the-market Program |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | $ 495,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares | shares |  | 6,600,000 |  |  |  |  |  |  |  |  |  |
Number of sales agency agreements | Agreement |  |  |  | 3 |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | $ 0 |  |  |  |  |  |  |  |
Fees and commissions paid |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |
Shelf Registration for Sale of Common Stock through At-the-market Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock authorized amount |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
[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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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