Quarterly Financial and Common Stock Data (Unaudited) (Quarterly Financial and Common Stock Data) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Operating Revenue	$ 2,556		$ 2,971		$ 2,747		$ 3,409		$ 2,943		$ 3,050		$ 2,813		$ 3,630		$ 11,683		$ 12,436		$ 13,120
Income from operations	638		1,123		773		1,002		638		921		394		768		3,536		2,721		3,316
Net income including noncontrolling interests	366		599		418		540		249		531		161		385		1,923		1,326		1,720
Income from continuing operations	357	[1]	593	[1]	413	[1]	536	[1]	243	[1]	529	[1]	159	[1]	379	[1]	1,899	[1]	1,310	[1]	1,789
Net income (loss) attributable to Dominion	$ 357		$ 593		$ 413		$ 536		$ 243		$ 529		$ 159		$ 379		1,899		1,310		1,697
Net income including noncontrolling interests																	$ 1,923		$ 1,326		$ 1,720
Income from continuing operations - basic (in dollars per share)	$ 0.60	[1]	$ 1.00	[1]	$ 0.70	[1]	$ 0.91	[1]	$ 0.42	[1]	$ 0.91	[1]	$ 0.27	[1]	$ 0.65	[1]	$ 3.21	[1]	$ 2.25	[1]	$ 3.09
Net income attributable to Dominion (in dollars per share)	0.60		1.00		0.70		0.91		0.42		0.91		0.27		0.65		3.21		2.25		2.93
Income from continuing operations - diluted (in dollars per share)	0.60	[1]	1.00	[1]	0.70	[1]	0.91	[1]	0.42	[1]	0.90	[1]	0.27	[1]	0.65	[1]	3.20	[1]	2.24	[1]	3.09
Net income attributable to Dominion - diluted (in dollars per share)	0.60		1.00		0.70		0.91		0.42		0.90		0.27		0.65		3.20		2.24		2.93
Dividends declared per common share	$ 0.6475		$ 0.6475		$ 0.6475		$ 0.6475		$ 0.6		$ 0.6		$ 0.6		$ 0.6		$ 2.59		$ 2.40		$ 2.25
Virginia Electric and Power Company
Condensed Financial Statements, Captions [Line Items]
Operating Revenue	$ 1,614		$ 2,058		$ 1,813		$ 2,137		$ 1,814		$ 2,053		$ 1,729		$ 1,983		$ 7,622	[2]	$ 7,579	[2]	$ 7,295	[2]
Income from operations	374		741		481		525		312		594		205		613		2,121		1,724		2,080
Net income (loss) attributable to Dominion	187		385		246		269		151		314		69		324		1,087		858		1,138
Net income including noncontrolling interests	187		385		246		269		148		312		67		318		1,087		845		1,121
Dominion Gas Holdings, LLC
Condensed Financial Statements, Captions [Line Items]
Operating Revenue	425		365		395		531		510		391		428		569		1,716	[3]	1,898	[3]	1,937	[3]
Income from operations	163		202		153		271		255		177		154		265		789		851		762
Net income (loss) attributable to Dominion	$ 100		$ 111		$ 85		$ 161		$ 148		$ 107		$ 93		$ 164		$ 457		$ 512		$ 461
Maximum
Condensed Financial Statements, Captions [Line Items]
Share Price	$ 74.88		$ 76.59		$ 74.34		$ 79.89		$ 80.89		$ 71.62		$ 73.75		$ 72.22		$ 74.88		$ 80.89
Common stock market value (high)																	79.89		80.89
Minimum
Condensed Financial Statements, Captions [Line Items]
Share Price	$ 64.54		$ 66.65		$ 66.52		$ 68.25		$ 65.53		$ 64.71		$ 67.06		$ 63.14		64.54		65.53
Common stock market value (low)																	$ 64.54		$ 63.14

[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.