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Commitments and Contingencies (Narrative) (Details) | 1 Months Ended | 3 Months Ended
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Apr. 30, 2017 petition station | Mar. 31, 2017 USD ($) facility site count | Jul. 31, 2016 party | Apr. 30, 2016 | Oct. 31, 2015 | Jun. 30, 2015 party | Apr. 30, 2015 facility | Oct. 31, 2014 facility | Jun. 30, 2014 unit | Jul. 31, 2013 count unit | Jul. 31, 2011 | Mar. 31, 2017 USD ($) facility site party
CWA | Virginia Electric and Power Company | Possum Point Power Station |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period for remedial plan |  |  |  |  |  |  |  |  |  |  |  | 30 days
Unfavorable Regulatory Action | EPA | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum period for consideration of CO2 emissions from biomass projects |  |  |  |  |  |  |  |  |  |  | 3 years |
Unfavorable Regulatory Action | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of coal fired generating units | unit |  |  |  |  |  |  |  |  |  | 3 |  |
Unfavorable Regulatory Action | MATS | EPA |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extension period for MATS compliance |  |  |  |  |  |  |  |  | 1 year |  |  |
Number of coal fired generating units | unit |  |  |  |  |  |  |  |  | 2 |  |  |
Requested compliance extension under EPA Administrative Order |  |  |  |  | 1 year |  |  |  |  |  |  |
Unfavorable Regulatory Action | MATS | EPA | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period to be in service following receipt of all required permits | 20 months |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | MATS | EPA | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extension period for MATS compliance |  |  |  | 1 year |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Ozone Standards | EPA | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  | $ 25,000,000
Unfavorable Regulatory Action | Ozone Standards | EPA | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated compliance costs |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  | $ 35,000,000
Unfavorable Regulatory Action | CWA |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that may be subject to final regulations | facility |  |  |  |  |  |  |  | 14 |  |  |  |
Unfavorable Regulatory Action | CWA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that may be subject to final regulations | facility |  |  |  |  |  |  |  | 11 |  |  |  |
Unfavorable Regulatory Action | CWA | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that maybe subject to additional wastewater treatment requirements | facility |  | 8 |  |  |  |  |  |  |  |  |  | 8
Unfavorable Regulatory Action | CWA | EPA | Subsequent Event | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of separate petitions for reconsideration granted | petition | 2 |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site |  | 19 |  |  |  |  |  |  |  |  |  | 19
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Former Gas Plant Site with Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of former sites | site |  |  |  |  |  |  |  |  |  |  |  | 1
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site |  | 12 |  |  |  |  |  |  |  |  |  | 12
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant sites | site |  | 3 |  |  |  |  |  |  |  |  |  | 3
Preliminary costs for options under evaluation for site, minimum |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  | $ 1,000,000
Preliminary costs for options under evaluation for site, maximum |  | 22,000,000 |  |  |  |  |  |  |  |  |  | 22,000,000
Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to CCR Final Rule |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities with CCR | facility |  |  |  |  |  |  | 8 |  |  |  |  |
Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Subsequent Event | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to CCR Final Rule |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of stations | station | 4 |  |  |  |  |  |  |  |  |  |  |
Breach of Contract Lawsuit | DTI | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total number of counts in complaint | count |  |  |  |  |  |  |  |  |  | 8 |  |
Accrued liability for legal matter |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  | $ 6,000,000
Breach of Contract Lawsuit | DTI | Judicial Ruling |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of counts dismissed | count |  | 3 |  |  |  |  |  |  |  |  |  |
Liquefaction Project | FERC | Cove Point | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of parties | party |  |  |  |  |  |  |  |  |  |  |  | 2
Liquefaction Project | FERC | Cove Point | Judicial Ruling |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of parties | party |  |  | 1 |  |  | 1 |  |  |  |  |  |

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