Commitments and Contingencies (Lease Commitments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
2011	$ 83
2012	79
2013	68
2014	60
2015	52
Thereafter	185
Total	$ 527

Capital And Operating Lease Obligations Due In Three Years

No definition available.

Name:	d_CapitalAndOperatingLeaseObligationsDueInThreeYears
Namespace Prefix:	d_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant