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Commitments and Contingencies (Narrative) (Details) (USD $)
1 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Feb. 28, 2013
T
Sep. 30, 2011
Party
Sep. 30, 2013
Site
Dec. 31, 2012
T
Sep. 30, 2013
Third Party and Equity Method Investee
Sep. 30, 2013
Third Party and Equity Method Investee
Through 2019
Sep. 30, 2013
September 2013
Nuclear Obligations
Sep. 30, 2013
Minimum
Sep. 30, 2013
Maximum
Jul. 31, 2011
CAA
Group
MW
State
Sep. 30, 2013
CAA
Apr. 25, 2013
CAA
Sep. 30, 2013
Virginia Electric and Power Company
Site
Investments in and Advances to Affiliates [Line Items]                          
Number of states under EPA replacement rule                   28      
Emissions of fossil fuel fired electric generating units (MW)                   25      
Number of groups of affected states                   2      
Amount of civil penalty         $ 68,000,000           $ 13,000,000 $ 3,000,000  
Amount to fund environmental mitigation projects                       10,000,000  
Number of parties issued UAO   22                      
Daily civil penalties for non compliance     37,500                    
Number of former manufactured gas plant sites     17                   3
Percentage reduction in CO2 Emissions 10.00%                        
CO2 emissions cap 91,000,000     165,000,000                  
Percent further emmision reduction goals in participating state power plant CO2 emissions (percentage)     2.50%                    
Liability protection per nuclear incident             13,600,000,000            
Inflationary provision adjustment period     5 years                    
Coverage from commercial insurance pools     375,000,000                    
Amounts assessed for each licensed reactor     127,000,000                    
Amount assessed per year per reactor     19,000,000                    
Minimum requirement for nuclear power plant licenses per reactor site     1,060,000,000                    
Maximum retrospective premium assessment for nuclear power plant licensees     71,000,000                   39,000,000
Maximum retrospective premium assessment for replacement power costs     19,000,000                   9,000,000
Exposure under guarantees     4,423,000,000   38,000,000 90,000,000              
Annual future contributions               4,000,000 19,000,000        
Purchased surety bonds     146,000,000                   59,000,000
Authorized issuance of standby letters of credit     $ 18,000,000                   $ 1,000,000