Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowance - Customer Receivables	$ 28	$ 29
Allowance - Other	4	8
Common Stock, shares authorized	1,000,000,000
Common stock, shares outstanding	576,000,000	570,000,000
Virginia Electric and Power Company
Allowance - Customer Receivables	10	11
Allowance - Other	$ 3	$ 7
Common Stock, shares authorized	500,000	500,000
Common stock, shares outstanding	274,723	274,723