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Investments (Selected Information Regarding Marketable Equity and Debt Securities) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Available-for-sale securities:    
Proceeds from sales $ 337us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 442us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Realized gains 56us-gaap_AvailableForSaleSecuritiesGrossRealizedGains [1] 38us-gaap_AvailableForSaleSecuritiesGrossRealizedGains [1]
Realized losses 17us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses [1] 6us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses [1]
Virginia Electric and Power Company    
Available-for-sale securities:    
Proceeds from sales 133us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
204us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
Realized gains 18us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
[1] 19us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
[1]
Realized losses $ 11us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
[1] $ 3us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ dei_LegalEntityAxis
= d_VirginiaElectricAndPowerCompanyMember
[1]
[1] Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.