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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.

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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