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Variable Interest Entities (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) MW generator | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Variable Interest Entities [Line Items] |  |  |  |
Securities due within one year | $ 2,391 |  | $ 1,709 | [1]
Long term debt | 31,096 |  | 30,231 | [1]
Virginia Electric and Power Company |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Securities due within one year | 928 |  | 678 | [2]
Long term debt | 10,348 |  | 9,852 | [2]
Dominion Gas Holdings, LLC |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Long term debt | 3,533 |  | $ 3,528 | [3]
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Securities due within one year | 30 |  |  |
Long term debt | $ 365 |  |  |
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability | Virginia Electric and Power Company |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Long term capacity contract non utility generators (generators) | generator | 3 |  |  |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW | 418 |  |  |
Remaining purchase commitments | $ 258 |  |  |
Payment for electric capacity | 28 | $ 37 |  |
Payment for electric energy | 8 | 7 |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DRS |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Shared services purchased | 85 | 114 |  |
Variable Interest Entity, Not Primary Beneficiary | Dominion Gas Holdings, LLC | DRS |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Shared services purchased | $ 31 | $ 35 |  |
[1] | Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Gas’ Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.

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- Definition This item represents the entity's aggregate generation capacity from long-term power and capacity contracts. + References No definition available. + Details
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- Definition Costs incurred in purchasing electric capacity. + References No definition available. + Details
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- Definition Long Term Capacity Contract Non Utility Generators + References No definition available. + Details
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- Definition Cost incurred in providing energy services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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