Accumulated Other Comprehensive Income (Schedule of Changes in AOCI by Component Net of Tax) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (820)			$ (877)	[1]
Other comprehensive income before reclassifications: gains (losses)	353			341
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	(16)	[2]		53	[2]
Total other comprehensive income (loss)	337		(44)	394		155
Ending balance	(483)			(483)
Deferred gains and losses on derivatives-hedging activities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(136)			(122)
Other comprehensive income before reclassifications: gains (losses)	122			32
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	(17)	[2]		59	[2]
Total other comprehensive income (loss)	105			91
Ending balance	(31)			(31)
Unrealized gains and losses on investment securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	377			326
Other comprehensive income before reclassifications: gains (losses)	3			81
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	(9)	[2]		(36)	[2]
Total other comprehensive income (loss)	(6)			45
Ending balance	371			371
Unrecognized pension and other postretirement benefit costs
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,061)			(1,081)
Other comprehensive income before reclassifications: gains (losses)	228			228
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	10	[2]		30	[2]
Total other comprehensive income (loss)	238			258
Ending balance	$ (823)			$ (823)

[1] Dominion’s Consolidated Balance Sheet at December 31, 2012 has been derived from the audited Consolidated Financial Statements at that date.

[2] See table below for details about these reclassifications.