Consolidated Statements of Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2013
Income Statement [Abstract]
Income tax benefit	$ 6	$ (43)

Income Tax Expense (Benefit), Discontinued Operations

No definition available.

Name:	d_IncomeTaxExpenseBenefitDiscontinuedOperations
Namespace Prefix:	d_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration