Long-Term Debt (Total Long Term Debt) (Details) (USD $)	12 Months Ended						12 Months Ended							12 Months Ended		12 Months Ended																																				12 Months Ended											1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 1.4% to 7.195%, due 2013 to 2018	Dec. 31, 2013 2.75% to 8.875% due 2018 to 2042	Dec. 31, 2013 Unsecured Convertible Senior Notes, 2.125%, due 2023	Dec. 31, 2013 Unsecured Junior Subordinated Notes Payable to Affiliated Trusts, 7.83% and 8.4%, due 2027 and 2031	Dec. 31, 2013 7.5% and 8.375%, due 2064 and 2066	Dec. 31, 2013 Remarketable Subordinated Notes, 1.07% and 1.18%, due 2019 and 2021	Dec. 31, 2013 5.0% and 6.625%, due 2013 and 2014	Dec. 31, 2013 6.8% and 6.875%, due 2026 and 2027	Dec. 31, 2013 Secured Senior Notes, 5.13% to 5.78%, due 2013	Dec. 31, 2013 Secured Senior Note, 7.33%, due 2020	Dec. 31, 2013 2.25% to 5.75%, due 2033 to 2042	Dec. 31, 2013 5.25% Senior Notes Due 2033	Dec. 31, 2013 8.875% Senior Notes Due 2019	Dec. 31, 2013 Senior Notes Variable rates, due 2013 and 2014	Dec. 31, 2012 Senior Notes Variable rates, due 2013 and 2014	Dec. 31, 2013 Senior Notes 1.4% to 7.195%, due 2013 to 2018	Dec. 31, 2012 Senior Notes 1.4% to 7.195%, due 2013 to 2018	Dec. 31, 2013 Senior Notes 2.75% to 8.875% due 2018 to 2042	Dec. 31, 2012 Senior Notes 2.75% to 8.875% due 2018 to 2042	Dec. 31, 2013 Senior Notes Unsecured Convertible Senior Notes, 2.125%, due 2023	Dec. 31, 2012 Senior Notes Unsecured Convertible Senior Notes, 2.125%, due 2023	Dec. 31, 2013 Senior Notes Remarketable Subordinated Notes, 1.07% and 1.18%, due 2019 and 2021	Dec. 31, 2012 Senior Notes Remarketable Subordinated Notes, 1.07% and 1.18%, due 2019 and 2021	Dec. 31, 2013 Senior Notes 5.0% and 6.625%, due 2013 and 2014	Dec. 31, 2012 Senior Notes 5.0% and 6.625%, due 2013 and 2014	Dec. 31, 2013 Senior Notes 6.8% and 6.875%, due 2026 and 2027	Dec. 31, 2012 Senior Notes 6.8% and 6.875%, due 2026 and 2027	Dec. 31, 2013 Senior Notes Unsecured Senior Notes, 1.05% to 4.8%, due 2016 to 2043	Dec. 31, 2012 Senior Notes Unsecured Senior Notes, 1.05% to 4.8%, due 2016 to 2043	Dec. 31, 2013 Senior Notes Secured Senior Notes, 5.13% to 5.78%, due 2013	Dec. 31, 2012 Senior Notes Secured Senior Notes, 5.13% to 5.78%, due 2013	Dec. 31, 2013 Senior Notes Secured Senior Note, 7.33%, due 2020	Dec. 31, 2012 Senior Notes Secured Senior Note, 7.33%, due 2020	Dec. 31, 2013 Senior Notes Variable rate, due 2041	Dec. 31, 2012 Senior Notes Variable rate, due 2041	Dec. 31, 2013 Tax-Exempt Financings 2.25% to 5.75%, due 2033 to 2042	Dec. 31, 2012 Tax-Exempt Financings 2.25% to 5.75%, due 2033 to 2042	Dec. 31, 2013 Tax-Exempt Financings Variable rate, due 2041	Dec. 31, 2012 Tax-Exempt Financings Variable rate, due 2041	Dec. 31, 2013 Junior Subordinated Notes Unsecured Junior Subordinated Notes Payable to Affiliated Trusts, 7.83% and 8.4%, due 2027 and 2031	Dec. 31, 2012 Junior Subordinated Notes Unsecured Junior Subordinated Notes Payable to Affiliated Trusts, 7.83% and 8.4%, due 2027 and 2031	Dec. 31, 2013 Junior Subordinated Notes 7.5% and 8.375%, due 2064 and 2066	Dec. 31, 2012 Junior Subordinated Notes 7.5% and 8.375%, due 2064 and 2066	Dec. 31, 2013 Junior Subordinated Notes Enhanced Junior Subordinated Notes, variable rate, due 2066	Dec. 31, 2012 Junior Subordinated Notes Enhanced Junior Subordinated Notes, variable rate, due 2066	Dec. 31, 2013 Virginia Electric and Power Company	Dec. 31, 2012 Virginia Electric and Power Company	Dec. 31, 2013 Virginia Electric and Power Company Line of Credit	Dec. 31, 2013 Virginia Electric and Power Company 1.2% to 8.625%, due 2013 to 2018	Dec. 31, 2013 Virginia Electric and Power Company 2.75% to 8.875%, due 2019 to 2043	Dec. 31, 2013 Virginia Electric and Power Company 1.5% to 5.6%, due 2022 to 2040	Dec. 31, 2013 Virginia Electric and Power Company Senior Notes 1.2% to 8.625%, due 2013 to 2018	Dec. 31, 2012 Virginia Electric and Power Company Senior Notes 1.2% to 8.625%, due 2013 to 2018	Dec. 31, 2013 Virginia Electric and Power Company Senior Notes 2.75% to 8.875%, due 2019 to 2043	Dec. 31, 2012 Virginia Electric and Power Company Senior Notes 2.75% to 8.875%, due 2019 to 2043	Dec. 31, 2013 Virginia Electric and Power Company Tax-Exempt Financings Variable rates, due 2016 to 2041	Dec. 31, 2012 Virginia Electric and Power Company Tax-Exempt Financings Variable rates, due 2016 to 2041	Dec. 31, 2013 Virginia Electric and Power Company Tax-Exempt Financings 1.5% to 5.6%, due 2022 to 2040	Dec. 31, 2012 Virginia Electric and Power Company Tax-Exempt Financings 1.5% to 5.6%, due 2022 to 2040	May 31, 2013 Kincaid Power Station Secured Senior Note, 7.33%, due 2020	Jun. 30, 2013 Brayton Point Tax-Exempt Financings
Debt Instrument [Line Items]
Total principal, including VIE	$ 20,842,000,000	$ 18,988,000,000															$ 400,000,000	$ 400,000,000	$ 3,291,000,000	$ 3,541,000,000	$ 4,599,000,000	$ 4,599,000,000	$ 43,000,000	$ 82,000,000	$ 1,100,000,000	$ 0	$ 600,000,000	$ 622,000,000	$ 89,000,000	$ 89,000,000	$ 1,200,000,000	$ 0	$ 0	$ 842,000,000	$ 0	$ 145,000,000	$ 75,000,000	$ 0	$ 27,000,000	$ 284,000,000	$ 0	$ 75,000,000	$ 10,000,000	$ 268,000,000	$ 985,000,000	$ 985,000,000	$ 380,000,000	$ 380,000,000	$ 8,043,000,000	$ 6,676,000,000					$ 2,138,000,000	$ 2,306,000,000	$ 4,993,000,000	$ 3,408,000,000	$ 606,000,000	$ 454,000,000	$ 306,000,000	$ 508,000,000
Securities due within one year, including VIE	(1,519,000,000)	(2,223,000,000)																																															(58,000,000)	(418,000,000)
Unamortized discount and premium, net	(48,000,000)	(7,000,000)																																															(11,000,000)	(7,000,000)
Total long term debt, including VIE	19,330,000,000	16,851,000,000																																															7,974,000,000	6,251,000,000
Fair value hedge valuation	55,000,000	93,000,000
2013 Weighted- average Coupon	2.95%																0.37%		4.03%		5.64%				1.13%		5.00%		6.81%		3.13%						1.12%		2.38%				8.40%		8.11%		2.58%		4.10%						5.09%		5.25%		0.98%		3.16%
Debt instrument interest rate minimum				1.40%	2.75%		7.83%	7.50%	1.07%	5.00%	6.80%	5.03%		2.25%																																						1.20%	2.75%	1.50%
Debt instrument interest rate maximum				7.195%	8.875%		8.40%	8.375%	1.18%	6.625%	6.875%	5.78%		5.75%																																						8.625%	8.75%	5.60%
Credit facility, to support letters of credit																																																			120,000,000
Senior notes															510,000,000	600,000,000
RSN Annual Interest Rate						2.125%							7.33%		5.25%	8.875%
Long term debt maturity date															2033	2019
Redemption percentage of principal and accrued interest																100.00%
Percentage of the applicable conversion price	120.00%
Minimum consecutive trading days	20 days
Maximum consecutive trading days	30 days
Redemption percentage of principal amount	100.00%
Unamortized premium		18,000,000
Amount of notes redeemed	1,245,000,000	1,675,000,000	637,000,000																																																												185,000,000
Amount of bonds defeased																																																																257,000,000
Amount delivered to fund irrevocable trust																																																																284,000,000
Unamortized premium and discount	$ 14,000,000	$ 23,000,000