Fair Value Measurements Fair Value, Option, Quantitative Disclosures (Details) (USD $) In Millions, unless otherwise specified										9 Months Ended																																																						9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Level 3	Sep. 30, 2014 Level 3 Natural Gas Physical and Financial Forwards and Futures:		Sep. 30, 2014 Level 3 Natural Gas Physical and Financial Options:	Sep. 30, 2014 Level 3 FTRs Physical and Financial Forwards and Futures:	Sep. 30, 2014 Level 3 NGLs Physical and Financial Forwards and Futures:		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Options: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Options: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Options: Wieghted Average		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets NGLs Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets NGLs Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Assets NGLs Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Options: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Options: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Options: Wieghted Average		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities FTRs Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities FTRs Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities FTRs Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities NGLs Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities NGLs Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities NGLs Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Virginia Electric and Power Company	Dec. 31, 2013 Virginia Electric and Power Company	Sep. 30, 2014 Virginia Electric and Power Company Level 3	Sep. 30, 2014 Virginia Electric and Power Company Level 3 Natural Gas Physical and Financial Forwards and Futures:		Sep. 30, 2014 Virginia Electric and Power Company Level 3 FTRs Physical and Financial Forwards and Futures:	Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Assets Natural Gas Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Assets FTRs Physical and Financial Forwards and Futures: Wieghted Average		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Minimum		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities Natural Gas Physical and Financial Forwards and Futures: Maximum		Sep. 30, 2014 Virginia Electric and Power Company Level 3 Fair Value, Option, Quantitative Disclosures, Liabilities FTRs Physical and Financial Forwards and Futures: Wieghted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Derivative Assets	$ 732	$ 890	$ 70	$ 27	[1]	$ 3	$ 37	$ 3	[2]																																																	$ 53	$ 53	$ 50	$ 13	[1]	$ 37
Fair Value of Derivative Liabilities	$ 1,324	$ 1,102	$ 23	$ 15	[1]	$ 3	$ 4	$ 1	[2]																																																	$ 30	$ 12	$ 4			$ 4
Market Price (per unit)										(2)	[3]	5	[3]	(1)	[3],[4]	3	[3]	5	[3]	4	[3],[4]	(1)	[3]	16	[3]	2	[3],[4]	1	[3]	2	[3]	1	[3],[4]	(2)	[3]	5	[3]	2	[3],[4]	2	[3]	5	[3]	4	[3],[4]	(16)	[3]	16	[3]	(1)	[3],[4]	1	[3]	2	[3]	2	[3],[4]							(2)	[3]	5	[3]	(1)	[3],[4]	(1)	[3]	16	[3]	2	[3],[4]	(16)	[3]	16	[3]	(1)	[3],[4]
Credit spread (percentage)										1.00%	[5]	3.00%	[5]	2.00%	[4],[5]																																																	1.00%	[5]	3.00%	[5]	2.00%	[4],[5]
Price Volatility (percentage)																17.00%	[6]	51.00%	[6]	33.00%	[4],[6]																			17.00%	[6]	51.00%	[6]	37.00%	[4],[6]

[1] Includes basis.

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

[3] Represents market prices beyond defined terms for Levels 1 and 2.

[4] Averages weighted by volume.

[5] Represents credit spreads unrepresented in published markets.

[6] Represents volatilities unrepresented in published markets.