Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	$ 161	$ 163
Regulatory liabilities-noncurrent		2,745	2,622	[2]
Total regulatory liabilities		2,906	2,785
Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	33	61
PIPP
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	23	28
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[5]	1,450	1,427
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[6]	953	902
Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[7]	70	69
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		105	74
Regulatory liabilities-noncurrent		272	224
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	82	115
Regulatory liabilities-noncurrent		2,064	1,962	[8]
Total regulatory liabilities		2,146	2,077
Virginia Electric and Power Company | Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	33	61
Virginia Electric and Power Company | Provision for future cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[5]	965	946
Virginia Electric and Power Company | Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[6]	953	902
Virginia Electric and Power Company | Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[7]	70	69
Virginia Electric and Power Company | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		49	54
Regulatory liabilities-noncurrent		76	45
Dominion Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	46	35
Regulatory liabilities-noncurrent	[9]	237	219
Total regulatory liabilities		283	254
Dominion Gas Holdings, LLC | PIPP
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	23	28
Dominion Gas Holdings, LLC | Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-noncurrent	[5]	175	174
Dominion Gas Holdings, LLC | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		23	7
Regulatory liabilities-noncurrent		$ 62	$ 45

[1] Current regulatory liabilities are presented in other current liabilities in Dominion's, Virginia Power's and Dominion Gas' Consolidated Balance Sheets.

[2] Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.

[3] Reflects deferred fuel expenses for the Virginia and North Carolina jurisdictions of Dominion's and Virginia Power's generation operations.

[4] 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.

[5] 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.

[6] 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.

[7] 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.

[8] Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.

[9] Noncurrent regulatory liabilities are presented in other deferred credits and other liabilities in Dominion Gas' Consolidated Balance Sheets.