Accumulated Other Comprehensive Income (Schedule of Changes in AOCI by Component Net of Tax) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (877)	[1]
Other comprehensive income (loss) before reclassifications: gains (losses)	(12)
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	69	[2]
Total other comprehensive income	57		199
Ending balance	(820)
Deferred gains and losses on derivatives-hedging activities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(122)
Other comprehensive income (loss) before reclassifications: gains (losses)	(90)
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	76	[2]
Total other comprehensive income	(14)
Ending balance	(136)
Unrealized gains and losses on investment securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	326
Other comprehensive income (loss) before reclassifications: gains (losses)	78
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	(27)	[2]
Total other comprehensive income	51
Ending balance	377
Unrecognized pension and other postretirement benefit costs
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,081)
Other comprehensive income (loss) before reclassifications: gains (losses)	0
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	20	[2]
Total other comprehensive income	20
Ending balance	$ (1,061)

[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.