Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Customer receivables, allowance for doubtful accounts	$ 29	$ 28
Other receivables, allowance for doubtful accounts	4	4
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, shares outstanding (shares)	578,000,000	576,000,000
Virginia Electric and Power Company
Customer receivables, allowance for doubtful accounts	10	10
Other receivables, allowance for doubtful accounts	$ 3	$ 3
Common stock, shares authorized (shares)	500,000	500,000
Common stock, shares outstanding (shares)	274,723	274,723