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Goodwill and Intangible Assets (Components of Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 955 | $ 942
Accumulated Amortization | 337 | 372
Virginia Electric and Power Company |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 326 | 301
Accumulated Amortization | 101 | 88
Dominion Gas Holdings, LLC |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 147 | 211
Accumulated Amortization | 49 | 128
Software, licenses and other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 955 | 942
Accumulated Amortization | 337 | 372
Software, licenses and other | Virginia Electric and Power Company |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 326 | 301
Accumulated Amortization | 101 | 88
Software, licenses and other | Dominion Gas Holdings, LLC |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 147 | 211
Accumulated Amortization | $ 49 | $ 128

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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