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Commitments and Contingencies (Lease Commitments) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]  
2017 $ 72
2018 69
2019 58
2020 39
2021 32
Thereafter 238
Total 508
Virginia Electric and Power Company  
Loss Contingencies [Line Items]  
2017 33
2018 30
2019 24
2020 20
2021 16
Thereafter 32
Total 155
Dominion Gas Holdings, LLC  
Loss Contingencies [Line Items]  
2017 27
2018 26
2019 21
2020 8
2021 5
Thereafter 18
Total 105
Dominion Questar Corporation | Corporate office  
Loss Contingencies [Line Items]  
Amount included in property plant and equipment 30
Amount included in other deferred credits and other liabilities 35
Amount recorded in depreciation, depletion and amortization (less than $1 million) $ 1