Related Party Transactions (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Virginia Electric and Power Company
Related Party Transaction [Line Items]
Commodity purchases from affiliates	$ 120,000,000		$ 138,000,000		$ 435,000,000		$ 328,000,000
Services provided by affiliates	106,000,000	[1]	109,000,000	[1]	320,000,000	[1]	311,000,000	[1]
Services provided to affiliates	5,000,000		6,000,000		16,000,000		16,000,000
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries	0				0				0
Dominion Gas Holdings, LLC
Related Party Transaction [Line Items]
Amounts due to Dominion	0	[2]			0	[2]			1,000,000	[2]
Amounts due from Dominion	3,000,000	[3]			3,000,000	[3]			6,000,000	[3]
Commodity purchases from affiliates	6,000,000		19,000,000		14,000,000		28,000,000
Services provided to affiliates	19,000,000		31,000,000		65,000,000		75,000,000
Receivables from related parties	12,000,000				12,000,000				3,000,000
Affiliated notes receivable	8,000,000	[4]			8,000,000	[4]			5,000,000	[4]
Dominion Gas Holdings, LLC | Revolving Credit Facility | IRCA
Related Party Transaction [Line Items]
Borrowings under IRCA	1,600,000,000				1,600,000,000				1,300,000,000
Interest charges	1,000,000		11,000,000		3,000,000		32,000,000
Interest and related charges deferred as regulatory asset			4,000,000				12,000,000
Dominion Gas Holdings, LLC | Services provided by affiliates
Related Party Transaction [Line Items]
Commodity purchases from affiliates	27,000,000	[1]	22,000,000	[1]	78,000,000	[1]	81,000,000	[1]
Dominion Gas Holdings, LLC | Goods and services provided by Dominion Gas to affiliates
Related Party Transaction [Line Items]
Services provided by affiliates	2,000,000		2,000,000		8,000,000		11,000,000
Dominion Gas Holdings, LLC | Goods and services provided by Dominion Gas to related parties
Related Party Transaction [Line Items]
Services provided to affiliates	14,000,000		3,000,000		30,000,000		8,000,000
Principal Owner | Virginia Electric and Power Company
Related Party Transaction [Line Items]
Short term demand note	17,000,000				17,000,000				97,000,000
Other deferred credits and other liabilities
Related Party Transaction [Line Items]
Amounts due to Dominion	200,000,000				200,000,000				147,000,000
Other deferred charges and other assets
Related Party Transaction [Line Items]
Amounts due from Dominion	$ 26,000,000				$ 26,000,000

[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.