Quarterly Financial and Common Stock Data (Unaudited) (Quarterly Financial and Common Stock Data) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Operating Revenue	$ 2,943		$ 3,050		$ 2,813		$ 3,630		$ 3,185		$ 3,432		$ 2,980		$ 3,523		$ 12,436		$ 13,120		$ 12,835
Income from operations	638		921		394		768		804		1,034		548		930		2,721		3,316		2,858
Net income including noncontrolling interests	249		531		161		385		435		575		208		502		1,326		1,720		329
Income from continuing operations	243	[1]	529	[1]	159	[1]	379	[1]	431	[1]	592	[1]	272	[1]	494	[1]	1,310	[1]	1,789	[1]	1,427
Income (loss) from discontinued operations									0	[1]	(23)	[1]	(70)	[1]	1	[1]			(92)	[1]
Net income (loss) attributable to Dominion	243		529		159		379		431		569		202		495		1,310		1,697		302
Income from continuing operations - basic (in dollars per share)	$ 0.42	[1]	$ 0.91	[1]	$ 0.27	[1]	$ 0.65	[1]	$ 0.74	[1]	$ 1.02	[1]	$ 0.47	[1]	$ 0.86	[1]	$ 2.25	[1]	$ 3.09	[1]	$ 2.49
Income (loss) from discontinued operations - basic (in dollars per share)									$ 0.00	[1]	$ (0.04)	[1]	$ (0.12)	[1]	$ 0.00	[1]	$ 0.00		$ (0.16)	[1]	$ (1.96)
Net income attributable to Dominion (in dollars per share)	$ 0.42		$ 0.91		$ 0.27		$ 0.65		$ 0.74		$ 0.98		$ 0.35		$ 0.86		$ 2.25		$ 2.93		$ 0.53
Income from continuing operations - diluted (in dollars per share)	$ 0.42	[1]	$ 0.90	[1]	$ 0.27	[1]	$ 0.65	[1]	$ 0.74	[1]	$ 1.02	[1]	$ 0.47	[1]	$ 0.86	[1]	$ 2.24	[1]	$ 3.09	[1]	$ 2.49
Income (loss) from discontinued operations - diluted (in dollars per share)									$ 0.00	[1]	$ (0.04)	[1]	$ (0.12)	[1]	$ 0.00	[1]	$ 0.00		$ (0.16)	[1]	$ (1.96)
Net income attributable to Dominion - diluted (in dollars per share)	$ 0.42		$ 0.90		$ 0.27		$ 0.65		$ 0.74		$ 0.98		$ 0.35		$ 0.86		$ 2.24		$ 2.93		$ 0.53
Dividends declared per common share	$ 0.6		$ 0.6		$ 0.6		$ 0.6		$ 0.5625		$ 0.5625		$ 0.5625		$ 0.5625		$ 2.40		$ 2.25		$ 2.11
Virginia Electric and Power Company
Condensed Financial Statements, Captions [Line Items]
Operating Revenue	1,814		2,053		1,729		1,983		1,745		2,059		1,710		1,781		7,579	[2]	7,295	[2]	7,226	[2]
Income from operations	312		594		205		613		408		679		463		530		1,724		2,080		1,992
Net income (loss) attributable to Dominion	151		314		69		324		199		387		265		287		858		1,138		1,050
Balance available for common stock	148		312		67		318		194		383		261		283		845		1,121		1,034
Dominion Gas Holdings, LLC
Condensed Financial Statements, Captions [Line Items]
Operating Revenue	510		391		428		569		533		388		430		586		1,898	[3]	1,937	[3]	1,677	[3]
Income from operations	255		177		154		265		233		217		88		224		851		762		750
Net income (loss) attributable to Dominion	$ 148		$ 107		$ 93		$ 164		$ 140		$ 130		$ 53		$ 138		$ 512		$ 461		$ 459
Maximum
Condensed Financial Statements, Captions [Line Items]
Share Price	$ 80.89		$ 71.62		$ 73.75		$ 72.22		$ 67.97		$ 64.04		$ 61.85		$ 58.25		$ 80.89		$ 67.97
Common stock market value (high)																	$ 80.89		$ 67.97
Minimum
Condensed Financial Statements, Captions [Line Items]
Share Price	$ 65.53		$ 64.71		$ 67.06		$ 63.14		$ 61.36		$ 55.51		$ 53.79		$ 51.92		$ 65.53		$ 61.36
Common stock market value (low)																	$ 63.14		$ 51.97

[1] Amounts attributable to Dominion's common shareholders.

[2] See Note 24 for amounts attributable to affiliates.

[3] See Note 24 for amounts attributable to related parties.