Fair Value Measurements Fair Value, Option, Quantitative Disclosures (Details) (USD $) In Millions, unless otherwise specified											6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Level 3	Jun. 30, 2014 Level 3 Natural Gas Physical and Financial Forwards and Futures:		Jun. 30, 2014 Level 3 Natural Gas Physical and Financial Options:	Jun. 30, 2014 Level 3 FTRs Physical and Financial Forwards and Futures:		Jun. 30, 2014 Level 3 NGLs Physical and Financial Forwards and Futures:		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Wieghted Average		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Options: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Options: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Options: Wieghted Average		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Wieghted Average		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets NGLs Physical and Financial Forwards and Futures: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets NGLs Physical and Financial Forwards and Futures: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets NGLs Physical and Financial Forwards and Futures: Wieghted Average		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Wieghted Average		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Options: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Options: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Options: Wieghted Average		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities FTRs Physical and Financial Forwards and Futures: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities FTRs Physical and Financial Forwards and Futures: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities FTRs Physical and Financial Forwards and Futures: Wieghted Average		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities NGLs Physical and Financial Forwards and Futures: Minimum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities NGLs Physical and Financial Forwards and Futures: Maximum		Jun. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities NGLs Physical and Financial Forwards and Futures: Wieghted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	$ 739	$ 890	$ 36	$ 19	[1]	$ 4	$ 10	[2]	$ 3	[3]
Fair Value of Derivative Liabilities	$ 1,256	$ 1,102	$ 33	$ 20	[1]	$ 4	$ 3	[2]	$ 6	[3]
Market Price (per unit)											(2)	[4]	5	[4]	2	[4],[5]	3	[4]	5	[4]	4	[4],[5]	(1)	[4]	10	[4]	1	[4],[5]	1	[4]	3	[4]	1	[4],[5]	(2)	[4]	5	[4]	2	[4],[5]	2	[4]	5	[4]	4	[4],[5]	(10)	[4]	10	[4]	1	[4],[5]	1	[4]	3	[4]	1	[4],[5]
Price Volatility (percentage)																	14.00%	[6]	32.00%	[6]	24.00%	[5],[6]																			14.00%	[6]	32.00%	[6]	25.00%	[5],[6]

[1] Includes basis.

[2] Information represents Virginia Power's quantitative information about Level 3 fair value measurements.

[3] Information represents Dominion Gas' quantitative information about Level 3 fair value measurements.

[4] Represents market prices beyond defined terms for Levels 1 & 2.

[5] Averages weighted by volume.

[6] Represents volatilities unrepresented in published markets.