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Income Taxes (Narrative) (Details) - Virginia Electric and Power Company - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Dec. 31, 2016 | Jun. 30, 2017
Operating Loss Carryforwards [Line Items] |  |
Open tax year | 2011 |
Decrease in unrecognized tax benefits |  | $ 8
Recognized state tax benefit impacted the effective tax rate |  | 2
Realized interest income |  | $ 11

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