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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 268 $ 272
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 268 272
Total derivatives, not subject to a master netting or similar arrangement 6 7
Gross Amounts of Recognized Assets, Total 274 279
Derivative Asset 274 279
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 59 67
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 209 205
Commodity | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 206 211
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 206 211
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 6 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 200 197
Commodity | Exchange    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 42 44
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 42 44
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 42 44
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 0 0
Interest rate | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 20 17
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 20 17
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 11 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 9 8
Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 151 153
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 151 153
Total derivatives, not subject to a master netting or similar arrangement 27 41
Gross Amounts of Recognized Assets, Total 178 194
Derivative Asset 178 194
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 150 151
Virginia Electric and Power Company | Commodity | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 143 147
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 143 147
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 142 145
Virginia Electric and Power Company | Interest rate | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 8 6
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 8 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 0 0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts $ 8 $ 6