Employee Benefit Plans (Narrative) (Details) (USD $)	9 Months Ended									3 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Dominion Gas Holdings, LLC		Dec. 31, 2013 Dominion Gas Holdings, LLC		Sep. 30, 2014 Pension Benefits Dominion Gas Holdings, LLC Dominion	Dec. 31, 2013 Pension Benefits Dominion Gas Holdings, LLC Dominion	Sep. 30, 2014 Other Postretirement Benefits Dominion Gas Holdings, LLC Dominion	Dec. 31, 2013 Other Postretirement Benefits Dominion Gas Holdings, LLC Dominion	Sep. 30, 2014 Other Postretirement Benefits East Ohio
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plans and OPEB plans	$ 0	$ 0
Expected contribution to voluntary employees' beneficiary association	12,000,000	12,000,000
Amounts due from Dominion		3,000,000	[1]	6,000,000	[1]	604,000,000	577,000,000
Amounts due to Dominion		0	[2]	1,000,000	[2]			10,000,000	14,000,000
Retirement age in amendment of plan										65 years
Increase in accumulated postretirement benefit obligation										22,000,000
Reduction in net periodic benefit credit for 2014										$ 1,000,000
Discount rate used for re-measurement										4.20%

[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.