Derivatives and Hedge Accounting Activities (Selected Information Related to Gains (Losses) on Cash Flow Hedges Included in AOCI) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ (353)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(154)
Commodity | Gas Energy Contract
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(5)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(5)
Maximum Term	22 months
Commodity | Electricity Energy Contract
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(168)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(141)
Maximum Term	30 months
Commodity | Other Energy Contract
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(1)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(1)
Maximum Term	23 months
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(179)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(7)
Maximum Term	363 months
Dominion Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(16)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(7)
Dominion Gas Holdings, LLC | Commodity | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(4)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(4)
Maximum Term	6 months
Dominion Gas Holdings, LLC | Commodity | NGLs
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(3)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(3)
Maximum Term	6 months
Dominion Gas Holdings, LLC | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(9)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	$ 0
Maximum Term	363 months