Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Details) - USD ($)		Jun. 30, 2015		Jan. 31, 2015	[1]	Jan. 01, 2015	[1]	Dec. 31, 2014	[1]
Line of Credit Facility [Line Items]
Facility Limit		$ 4,500,000,000
Outstanding Commercial Paper		2,622,000,000
Outstanding Letters of Credit		56,000,000
Facility Capacity Available		1,822,000,000
Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit		1,750,000,000
Outstanding Commercial Paper		1,441,000,000
Outstanding Letters of Credit		0
Facility Capacity Available		309,000,000
Dominion Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit		500,000,000
Outstanding Commercial Paper		360,000,000
Outstanding Letters of Credit		0
Facility Capacity Available		140,000,000
Credit Facility 4 Billion
Line of Credit Facility [Line Items]
Facility Limit	[1]	4,000,000,000
Outstanding Commercial Paper	[1]	2,622,000,000
Outstanding Letters of Credit	[1]	0
Facility Capacity Available	[1]	1,378,000,000
Credit facility, to support letters of credit		1,500,000,000.0
Credit Facility 4 Billion | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit		1,500,000,000	[2]	$ 1,500,000,000.0		$ 1,250,000,000.00
Outstanding Commercial Paper	[2]	1,441,000,000
Outstanding Letters of Credit	[2]	0
Facility Capacity Available	[2]	59,000,000
Credit facility, to support letters of credit		1,500,000,000.0
Credit Facility 4 Billion | Dominion Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit		500,000,000	[3]					$ 1,000,000,000
Outstanding Commercial Paper	[3]	360,000,000
Outstanding Letters of Credit	[3]	0
Facility Capacity Available	[3]	140,000,000
Credit facility, to support letters of credit		1,500,000,000.0
Credit Facility 500 Million
Line of Credit Facility [Line Items]
Facility Limit	[4]	500,000,000
Outstanding Commercial Paper	[4]	0
Outstanding Letters of Credit	[4]	56,000,000
Facility Capacity Available	[4]	444,000,000
Credit Facility 500 Million | Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	[5]	250,000,000
Outstanding Commercial Paper	[5]	0
Outstanding Letters of Credit	[5]	0
Facility Capacity Available	[5]	250,000,000
Credit Facility 500 Million | Dominion Gas Holdings, LLC
Line of Credit Facility [Line Items]
Facility Limit	[6]	0
Outstanding Commercial Paper	[6]	0
Outstanding Letters of Credit	[6]	0
Facility Capacity Available	[6]	$ 0

[1] This credit facility has a maturity date of April 2019, and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion of letters of credit.

[2] This credit facility has a maturity date of April 2019, and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit. Virginia Power's current sub-limit under this credit facility can be increased or decreased multiple times per year. In January 2015, Virginia Power increased its sub-limit from $1.25 billion to $1.50 billion.

[3] This credit facility has a maturity date of April 2019, and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit. Dominion Gas' current sub-limit under this credit facility can be increased or decreased multiple times per year, up to a maximum of $1.0 billion.

[4] This credit facility has a maturity date of April 2019, and can be used to support bank borrowings, commercial paper and letter of credit issuances.

[5] This credit facility has a maturity date of April 2019, and can be used to support bank borrowings, commercial paper and letter of credit issuances. Virginia Power's current sub-limit under this credit facility can be increased or decreased multiple times per year.

[6] This credit facility has a maturity date of April 2019, and can be used to support bank borrowings, commercial paper and letter of credit issuances. Dominion Gas' current sub-limit under this credit facility can be increased or decreased multiple times per year.