Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data	Jun. 30, 2011	Dec. 31, 2010
Customer receivables, allowance for doubtful accounts	$ 28	$ 26
Other receivables, allowance for doubtful accounts	10	9
Common stock, no par value
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares outstanding	569,000,000	581,000,000
Virginia Electric and Power Company [Member]
Customer receivables, allowance for doubtful accounts	10	11
Other receivables, allowance for doubtful accounts	$ 7	$ 6
Common stock, no par value
Common stock, shares authorized	500,000	300,000
Common stock, shares outstanding	274,723	274,723