Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	$ 124	$ 100
Regulatory liabilities-non-current		2,597	2,285	[2]
Total regulatory liabilities		2,721	2,385
Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	62	0
Regulatory liabilities-non-current	[3]	27	97
PIPP
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	26	46
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		36	54
Regulatory liabilities-non-current		200	185
Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[5]	1,412	1,120
Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[6]	76	79
Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[7]	882	804
Virginia Electric and Power Company
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		75	35	[8]
Regulatory liabilities-non-current		1,967	1,929	[8]
Total regulatory liabilities		2,042	1,964
Virginia Electric and Power Company | Deferred cost of fuel used in electric generation
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[3]	62	0
Regulatory liabilities-non-current	[3]	27	97
Virginia Electric and Power Company | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		13	35
Regulatory liabilities-non-current		50	59
Virginia Electric and Power Company | Provision for future cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[5]	932	890
Virginia Electric and Power Company | Derivatives
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[6]	76	79
Virginia Electric and Power Company | Nuclear decommissioning trust
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[7]	882	804
Dominion Gas Holdings, LLC
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[1]	39	55
Regulatory liabilities-non-current	[9]	217	201
Total regulatory liabilities		256	256
Dominion Gas Holdings, LLC | PIPP
Regulatory Liabilities [Line Items]
Regulatory liabilities-current	[4]	26	46
Dominion Gas Holdings, LLC | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities-current		13	9
Regulatory liabilities-non-current		44	31
Dominion Gas Holdings, LLC | Provision for future cost of removal and AROs
Regulatory Liabilities [Line Items]
Regulatory liabilities-non-current	[5]	$ 173	$ 170

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

[2] Dominion’s Consolidated Balance Sheet at December 31, 2015 has been derived from the audited Consolidated Financial Statements at that date.

[3] Primarily reflects deferred fuel expenses for the Virginia jurisdiction of Dominion's and Virginia Power's generation operations. See Note 12 for more information.

[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] 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.

[7] 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.

[8] Virginia Power’s Consolidated Balance Sheet at December 31, 2015 has been derived from the audited Consolidated Financial Statements at that date.

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