Derivatives and Hedge Accounting Activities (Volume of our Derivative Activity) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Current
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate	$ 2,050
Current | Natural Gas (bcf): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	116,000,000,000	[1]
Current | Natural Gas (bcf): | Basis
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	466,000,000,000	[1]
Current | Electricity (MWh): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	14,814,767	[1]
Current | Electricity (MWh): | FTRs
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	41,316,345
Current | Capacity (MW)
Derivative Instruments, Gain (Loss) [Line Items]
Capacity of Electricity (in Megawatts)	83,050
Current | Liquids (gallons)
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	151,200,000	[2]
Noncurrent
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate	750
Noncurrent | Natural Gas (bcf): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	19,000,000,000	[1]
Noncurrent | Natural Gas (bcf): | Basis
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	281,000,000,000	[1]
Noncurrent | Electricity (MWh): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	14,935,144	[1]
Noncurrent | Electricity (MWh): | FTRs
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	437,384
Noncurrent | Capacity (MW)
Derivative Instruments, Gain (Loss) [Line Items]
Capacity of Electricity (in Megawatts)	18,300
Noncurrent | Liquids (gallons)
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	0	[2]
Virginia Electric and Power Company | Current
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate	600
Virginia Electric and Power Company | Current | Natural Gas (bcf): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	15,000,000,000
Virginia Electric and Power Company | Current | Natural Gas (bcf): | Basis
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	7,000,000,000
Virginia Electric and Power Company | Current | Electricity (MWh): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	624,800
Virginia Electric and Power Company | Current | Electricity (MWh): | FTRs
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	39,186,609
Virginia Electric and Power Company | Current | Capacity (MW)
Derivative Instruments, Gain (Loss) [Line Items]
Capacity of Electricity (in Megawatts)	75,500
Virginia Electric and Power Company | Noncurrent
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate	$ 0
Virginia Electric and Power Company | Noncurrent | Natural Gas (bcf): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	0
Virginia Electric and Power Company | Noncurrent | Natural Gas (bcf): | Basis
Derivative Instruments, Gain (Loss) [Line Items]
Volume of natural gas (in billion cubic feet and gallons)	0
Virginia Electric and Power Company | Noncurrent | Electricity (MWh): | Fixed Price
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	0
Virginia Electric and Power Company | Noncurrent | Electricity (MWh): | FTRs
Derivative Instruments, Gain (Loss) [Line Items]
Volume of electricity (in Megawatt hours)	0
Virginia Electric and Power Company | Noncurrent | Capacity (MW)
Derivative Instruments, Gain (Loss) [Line Items]
Capacity of Electricity (in Megawatts)	18,300

[1] Includes options.

[2] Includes NGLs and oil.