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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

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