Related Party Transactions (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Commodity purchases from affiliates	$ 113,000,000		$ 105,000,000		$ 315,000,000		$ 190,000,000
Services provided by affiliates	106,000,000	[1]	106,000,000	[1]	214,000,000	[1]	202,000,000	[1]
Services provided to affiliates	6,000,000		5,000,000		11,000,000		10,000,000
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries	0				0
Dominion Gas Holdings, LLC
Related Party Transaction [Line Items]
Amounts due to Dominion	1,000,000	[2]			1,000,000	[2]			1,000,000	[2]
Amounts due from Dominion	6,000,000	[3]			6,000,000	[3]			6,000,000	[3]
Commodity purchases from affiliates	6,000,000		7,000,000		8,000,000		9,000,000
Accounts receivable from related parties	6,000,000				6,000,000				3,000,000
Services provided to affiliates	21,000,000		22,000,000		46,000,000		44,000,000
Affiliated notes receivable	7,000,000	[4]			7,000,000	[4]			5,000,000	[4]
Dominion Gas Holdings, LLC | Revolving Credit Facility | IRCA
Related Party Transaction [Line Items]
Borrowings under IRCA	1,500,000,000				1,500,000,000				1,300,000,000
Interest charges	1,000,000		11,000,000		2,000,000		21,000,000
Interest and related charges deferred as regulatory asset			5,000,000				8,000,000
Dominion Gas Holdings, LLC | Services provided by affiliates
Related Party Transaction [Line Items]
Commodity purchases from affiliates	25,000,000	[1]	33,000,000	[1]	51,000,000	[1]	59,000,000	[1]
Dominion Gas Holdings, LLC | Goods and services provided by Dominion Gas to affiliates
Related Party Transaction [Line Items]
Services provided by affiliates	3,000,000		5,000,000		6,000,000		9,000,000
Dominion Gas Holdings, LLC | Goods and services provided by Dominion Gas to related parties
Related Party Transaction [Line Items]
Services provided to affiliates	7,000,000		2,000,000		16,000,000		5,000,000
Principal Owner | Virginia Electric and Power Company
Related Party Transaction [Line Items]
Short term demand note	0				0				97,000,000
Other deferred credits and other liabilities
Related Party Transaction [Line Items]
Amounts due to Dominion	182,000,000				182,000,000				147,000,000
Other deferred charges and other assets
Related Party Transaction [Line Items]
Amounts due from Dominion	$ 16,000,000				$ 16,000,000

[1] Amounts are subject to capitalization.

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

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

[4] Amounts are presented in other deferred charges and other assets in Dominion Gas' Consolidated Balance Sheets.