Property, Plant and Equipment (Property, Plant and Equipment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Utility:
Generation	$ 15,193	$ 14,018
Transmission	9,897	8,686
Distribution	12,354	11,714
Storage	2,350	2,190
Nuclear fuel	1,411	1,375
Gas gathering and processing	791	787
General and other	845	812
Other-including plant under construction	3,633	3,261
Total utility	46,474	42,843
Nonutility:
Merchant generation-nuclear	1,267	1,153
Merchant generation-other	2,023	1,328
Nuclear fuel	860	770
Other-including plant under construction	782	875
Total nonutility	4,932	4,126
Total property, plant and equipment	51,406	46,969
Virginia Electric and Power Company
Utility:
Generation	15,193	14,018
Transmission	5,884	4,959
Distribution	9,526	9,103
Nuclear fuel	1,411	1,375
General and other	697	668
Other-including plant under construction	2,464	2,719
Total utility	35,175	32,842
Nonutility:
Total nonutility	5	6
Total property, plant and equipment	35,180	32,848
Dominion Gas Holdings, LLC
Utility:
Transmission	3,690	3,407
Distribution	2,530	2,333
Storage	1,466	1,314
Gas gathering and processing	786	783
General and other	111	103
Plant under construction	179	175
Total utility	8,762	8,115
Nonutility:
E&P properties being amortized and other	140	125
Total nonutility	140	125
Total property, plant and equipment	$ 8,902	$ 8,240