Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Customer receivables, allowance for doubtful accounts	$ 28	$ 29
Other receivables, allowance for doubtful accounts	4	8
Common stock, shares authorized (shares)	1,000,000,000
Common stock, shares outstanding (shares)	575,000,000	570,000,000
Virginia Electric and Power Company
Customer receivables, allowance for doubtful accounts	10	11
Other receivables, allowance for doubtful accounts	$ 3	$ 7
Common stock, shares authorized (shares)	500,000
Common stock, shares outstanding (shares)	274,723