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Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation of certain fair value hedges $ (4) $ (1)
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt [1] 28,133 26,587
Junior subordinated notes [2] 2,980 2,980
Remarketable subordinated notes [2] 2,374 2,373
Estimate of Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt [1],[3] 29,918 28,273
Junior subordinated notes [2],[3] 2,981 2,893
Remarketable subordinated notes [2],[3] 2,431 2,418
Virginia Electric and Power Company | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt [2] 11,276 10,530
Virginia Electric and Power Company | Estimate of Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt [2],[3] 12,371 11,584
Dominion Gas Holdings, LLC | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt [4] 3,533 3,528
Dominion Gas Holdings, LLC | Estimate of Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total long-term debt [3],[4] $ 3,614 $ 3,603
[1] Carrying amount includes amounts which represent the unamortized debt issuance costs, discount or premium, and foreign currency remeasurement adjustments. At March 31, 2017 and December 31, 2016, includes the valuation of certain fair value hedges associated with fixed rate debt of $(4) million and $(1) 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.