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Fair Value Measurements (Financial Instruments Carrying Amounts and Fair Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation of certain fair value hedges $ (1) $ 7
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year [1] 26,587 21,873
Junior subordinated notes [2] 2,980 1,340
Remarketable subordinated notes [2] 2,373 2,080
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year [1],[3] 28,273 23,210
Junior subordinated notes [2],[3] 2,893 1,192
Remarketable subordinated notes [2],[3] 2,418 2,129
Virginia Electric and Power Company | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year [2] 10,530 9,368
Virginia Electric and Power Company | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year [2],[3] 11,584 10,400
Dominion Gas Holdings, LLC | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year [4] 3,528 3,269
Dominion Gas Holdings, LLC | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including securities due within one year [3],[4] $ 3,603 $ 3,299
[1] Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At December 31, 2016, and 2015, includes the valuation of certain fair value hedges associated with Dominion's fixed rate debt of $(1) million and $7 million, respectively.
[2] Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium.
[3] Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.
[4] Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments.