Regulatory Assets and Liabilities (Regulatory Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		$ 163	$ 100
Regulatory liabilities-non-current		2,622	2,285
Total regulatory liabilities		2,785	2,385
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		115	35
Regulatory liabilities-non-current		1,962	1,929
Total regulatory liabilities		2,077	1,964
Dominion Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		35	55
Regulatory liabilities-non-current		219	201
Total regulatory liabilities		254	256
Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	61	0
Regulatory liabilities-non-current	[1]	14	97
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	61	0
Regulatory liabilities-non-current	[1]	14	97
PIPP
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[2]	28	46
PIPP | Dominion Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[2]	28	46
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[3]	1,427	1,120
Provision for future cost of removal and AROs | Dominion Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[3]	174	170
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[4]	902	804
Nuclear decommissioning trust | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[4]	902	804
Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[5]	69	79
Derivatives | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[5]	69	79
Provision for future cost of removal | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[3]	946	890
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		74	54
Regulatory liabilities-non-current		210	185
Other | Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		54	35
Regulatory liabilities-non-current		31	59
Other | Dominion Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		7	9
Regulatory liabilities-non-current		$ 45	$ 31

[1] Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Dominion's and Virginia Power’s generation operations. See Note 13 for more information.

[2] Under PIPP, eligible customers can make reduced payments based on their ability to pay. The difference between the customer’s total bill and the PIPP plan amount is deferred and collected or returned annually under the PIPP rate adjustment clause according to East Ohio tariff provisions. See Note 13 for more information.

[3] Rates charged to customers by the Companies’ regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.

[4] Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power’s utility nuclear generation stations, in excess of the related AROs.

[5] As discussed under Derivative Instruments in Note 2, for jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or refunded to customers.