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Commitments and Contingencies (Nuclear Operations) (Narrative) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2013 $ / MWh | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Amount of coverage purchased from commercial insurance pools |  | $ 375 |  |
Maximum assessment for premiums on insurance policy |  | 87 |  |
Maximum assessment for insurance policy |  | 23 |  |
Current fee per MWh for electricity paid by civilian nuclear power generators | $ / MWh | 1 |  |  |
Waste fee recognized |  |  |  | $ 16
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Amount that could be assessed for each licensed reactor |  | 127 |  |
Amount that could be assessed for each licensed reactor per reactor |  | 19 |  |
Spent Nuclear Fuel |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Receivables |  | 56 | $ 87 |
Millstone Unit 1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Minimum financial assurance |  |  | 2,900 |
Surry and North Anna |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Settlement amount |  | 30 | 8 | 27
Millstone |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Settlement amount |  | 22 | 17 | 17
Kewaunee |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Settlement amount |  |  | 7 |
Virginia Electric and Power Company |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Maximum assessment for premiums on insurance policy |  | 49 |  |
Maximum assessment for insurance policy |  | 10 |  |
Waste fee recognized |  |  |  | $ 10
Virginia Electric and Power Company | Spent Nuclear Fuel |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Receivables |  | $ 37 | 54 |
Virginia Electric and Power Company | Kewaunee |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Minimum financial assurance |  |  | $ 1,800 |

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