Regulatory Assets and Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Regulatory Assets And Liabilities [Line Items]
DOE Claims	$ 2,161us-gaap_RegulatoryLiabilities	$ 2,129us-gaap_RegulatoryLiabilities
Maximum amortization period for deferred operation and maintenance costs	18 months
Regulatory assets represented past expenditures not earning return	218
Period expenditures expected to be recovered (years)	2 years
Virginia Electric and Power Company
Regulatory Assets And Liabilities [Line Items]
DOE Claims	1,773	1,638
Regulatory assets represented past expenditures not earning return	165
Dominion Gas Holdings, LLC
Regulatory Assets And Liabilities [Line Items]
DOE Claims	267	282
Regulatory assets represented past expenditures not earning return	45
DOE Claims
Regulatory Assets And Liabilities [Line Items]
DOE Claims	$ 5	$ 5

Regulatory Asset, Amortization Period

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- Details

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- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

+ Details

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- Definition

Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 55

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6591318&loc=d3e44360-110383

+ Details

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- Definition

Remaining recovery period of regulatory assets for which no return on investment during recovery period is provided, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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