Employee Benefit Plans (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plans and OPEB plans	$ 0
Expected contribution to voluntary employees' beneficiary association	12,000,000
Dominion Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plans and OPEB plans	0
Expected contribution to voluntary employees' beneficiary association	12,000,000
Amounts due from Dominion	6,000,000	[1]	6,000,000	[1]
Amounts due to Dominion	1,000,000	[2]	1,000,000	[2]
Pension Benefits | Dominion Gas Holdings, LLC | Dominion
Defined Benefit Plan Disclosure [Line Items]
Amounts due from Dominion	595,000,000		577,000,000
Other Postretirement Benefits | Dominion Gas Holdings, LLC | Dominion
Defined Benefit Plan Disclosure [Line Items]
Amounts due to Dominion	$ 11,000,000		$ 14,000,000

[1] Amounts are presented in other current assets in Dominion Gas' Consolidated Balance Sheets.

[2] Amounts are presented in other current liabilities in Dominion Gas' Consolidated Balance Sheets.