2.2.0.7 false Operating Revenue (Detail) (USD $) 145 - Disclosure - Operating Revenue (Detail) true false In Millions false false 1 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 $ false 2 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 3 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 pure Standard http://www.xbrl.org/2003/instance pure 0 shares Standard http://www.xbrl.org/2003/instance shares 0 $ false 4 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 pure Standard http://www.xbrl.org/2003/instance pure 0 $ 5 Electric sales: 3 us-gaap_ElectricUtilityRevenueAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 6 Regulated 4 us-gaap_ElectricDomesticRegulatedRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 2083000000 2083 false false false 2 true true false false 1905000000 1905 false false false 3 true true false false 5488000000 5488 false false false 4 true true false false 5377000000 5377 false false false xbrli:monetaryItemType monetary Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity. No authoritative reference available. false 7 Nonregulated 4 us-gaap_ElectricWorldwideUnregulatedRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1072000000 1072 false false false 2 false true false false 999000000 999 false false false 3 false true false false 2857000000 2857 false false false 4 false true false false 2917000000 2917 false false false xbrli:monetaryItemType monetary Revenue derived from the unregulated generation, transmission and distribution of electricity. No authoritative reference available. false 8 Gas sales: 3 d_GasUtilityRevenueAbstract d false na duration Gas Utility Revenue [Abstract] false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Gas Utility Revenue [Abstract] false 9 Regulated 4 us-gaap_RegulatedOperatingRevenueGas us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 25000000 25 false false false 2 false true false false 26000000 26 false false false 3 false true false false 209000000 209 false false false 4 false true false false 403000000 403 false false false xbrli:monetaryItemType monetary The amount of regulated gas operating revenues recognized during the period. No authoritative reference available. false 10 Nonregulated 4 d_UnregulatedOperatingRevenueGas d false credit duration The amount of nonregulated gas operating revenues recognized during the period. false false false false false false false false false false false verboselabel false 1 false true false false 375000000 375 false false false 2 false true false false 351000000 351 false false false 3 false true false false 1502000000 1502 false false false 4 false true false false 1671000000 1671 false false false xbrli:monetaryItemType monetary The amount of nonregulated gas operating revenues recognized during the period. No authoritative reference available. false 11 Gas transportation and storage 4 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 289000000 289 false false false 2 false true false false 242000000 242 false false false 3 false true false false 1070000000 1070 false false false 4 false true false false 924000000 924 false false false xbrli:monetaryItemType monetary Revenue related to midstream and downstream gas activities. May include the following: gathering from wells, processing to remove impurities, storage, transmission, and the sale of natural gas and related products. No authoritative reference available. false 12 Other 4 us-gaap_OtherSalesRevenueNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 106000000 106 false false false 2 false true false false 107000000 107 false false false 3 false true false false 325000000 325 false false false 4 false true false false 330000000 330 false false false xbrli:monetaryItemType monetary Revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 13 Total operating revenue 4 us-gaap_SalesRevenueNet us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false 3950000000 3950 false false false 2 true true false false 3630000000 3630 [1] false false false 3 true true false false 11451000000 11451 false false false 4 true true false false 11622000000 11622 [1] false false false xbrli:monetaryItemType monetary Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 1 Dominion's Consolidated Statements of Income for the three and nine months ended September 30, 2009 have been recast to reflect Peoples as discontinued operations, as discussed in Note 3. 4 9 false Millions UnKnown UnKnown false true