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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015
Accounting Policy [Line Items] |  |  |  |  |
Accrued unbilled revenue |  | $ 631 | $ 462 |  |
Percentage of fuel currently subject to deferred fuel accounting |  | 84.00% |  |  |
Accounts payable for checks outstanding |  | $ 24 | 27 |  |
Margin deposit assets |  | 82 | 16 |  |
Capitalized interest costs and AFUDC |  | 159 | 100 | $ 80 |
Virginia Electric and Power Company |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Accrued unbilled revenue |  | 349 | 333 |  |
Refund received of income tax payments | $ 300 |  |  |  |
Accounts payable for checks outstanding |  | 11 | 11 |  |
Capitalized interest costs |  | 21 | 30 | 39 |
AFUDC related to projects |  | 31 | 19 | 8 |
Dominion Gas Holdings, LLC |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Accrued unbilled revenue |  | 134 | 98 |  |
Refund received of income tax payments | $ 92 |  |  |  |
Accounts payable for checks outstanding |  | 9 | 7 |  |
Capitalized interest costs |  | 8 | 1 | $ 1 |
Inventory under LIFO method |  | 13 | 24 |  |
Amount exceeded on LIFO basis |  | 55 | 109 |  |
Federal | Virginia Electric and Power Company |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Affiliated payables for estimated income taxes owed |  |  | 9 |  |
Noncurrent income tax payable |  | 2 |  |  |
Federal | Dominion Gas Holdings, LLC |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Noncurrent income tax payable |  | 1 |  |  |
State | Virginia Electric and Power Company |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Income tax receivable |  | 6 | 10 |  |
Affiliated payables for estimated income taxes owed |  |  | 1 |  |
Noncurrent income tax payable |  |  | 2 |  |
Noncurrent income taxes receivable |  | 13 | 14 |  |
State | Dominion Gas Holdings, LLC |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Income tax receivable |  | 1 | 4 |  |
Affiliated payables for estimated income taxes owed |  |  | 1 |  |
Noncurrent income tax payable |  | 7 | 22 |  |
Affiliated Entity | Virginia Electric and Power Company |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Income tax receivable |  | 112 |  |  |
Affiliated Entity | Dominion Gas Holdings, LLC |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Income tax receivable |  | 11 | 91 |  |
Affiliated Entity | Federal | Virginia Electric and Power Company |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Income tax receivable |  | 122 | $ 296 |  |
Affiliated Entity | Federal | Dominion Gas Holdings, LLC |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Income tax receivable |  | 10 |  |  |
Affiliated Entity | State | Virginia Electric and Power Company |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Affiliated payables for estimated income taxes owed |  | 10 |  |  |
Affiliated Entity | State | Dominion Gas Holdings, LLC |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
Income tax receivable |  | $ 1 |  |  |
Merchant Solar Projects | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |
SunEdison's ownership percentage interest in merchant solar projects |  | 33.00% |  |  | 33.00%

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