Significant Financing Transactions - (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Details) (USD $)	Jun. 30, 2014	Jun. 30, 2014 Virginia Electric and Power Company		Jul. 10, 2014 Virginia Electric and Power Company Subsequent Event	Jun. 30, 2014 Credit Facility 4 Billion		May 31, 2014 Credit Facility 4 Billion		Jul. 09, 2014 Credit Facility 4 Billion Subsequent Event		Jun. 30, 2014 Credit Facility 4 Billion Virginia Electric and Power Company		Jul. 10, 2014 Credit Facility 4 Billion Virginia Electric and Power Company Subsequent Event		Jul. 09, 2014 Credit Facility 4 Billion Virginia Electric and Power Company Subsequent Event		Jun. 30, 2014 Credit Facility 500 Million		Jun. 30, 2014 Credit Facility 500 Million Virginia Electric and Power Company
Line of Credit Facility [Line Items]
Facility Limit	$ 4,500,000,000	$ 1,250,000,000	[1]	$ 1,500,000,000.0	$ 4,000,000,000	[2]	$ 3,000,000,000	[2]	$ 4,000,000,000	[2]	$ 1,000,000,000	[1],[3]	$ 1,250,000,000.00	[3]	$ 1,000,000,000.0	[3]	$ 500,000,000	[4]	$ 250,000,000	[1],[5]
Outstanding Commercial Paper	3,080,000,000	1,323,000,000			2,848,000,000	[2]					1,091,000,000	[3]					232,000,000	[4]	232,000,000	[5]
Outstanding Letters of Credit	115,000,000	18,000,000			0	[2]					0	[3]					115,000,000	[4]	18,000,000	[5]
Facility Capacity Available	1,305,000,000	(91,000,000)	[1]		1,152,000,000	[2]					(91,000,000)	[1],[3]					153,000,000	[4]	0	[1],[5]
Credit Facility, to support letters of credit					$ 1,500,000,000.0						$ 1,500,000,000.0

[1] On June 30, 2014, Virginia Power's facility sub-limit was exceeded; however, Virginia Power retained ongoing access to its short-term demand note with Dominion as discussed in Note 17 and remained in compliance with its debt covenants. Effective July 10, 2014, Virginia Power increased its sub-limit under the $4 billion credit facility from $1.0 billion to $1.25 billion bringing its total sub-limit to $1.5 billion.

[2] In May 2014, this credit facility was amended and restated. The facility limit was increased from $3 billion to $4 billion and the maturity date was extended from September 2018 to April 2019. This credit facility 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.

[3] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility 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.

[4] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings, commercial paper and letter of credit issuances.

[5] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility 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.