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Regulatory Assets and Liabilities (Regulatory Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | $ 244 | $ 351
Regulatory assets-non-current |  | 2,473 | 1,865
Total regulatory assets |  | 2,717 | 2,216
Regulatory assets represented past expenditures not earning return |  | $ 303 |
Period expenditures expected to be recovered (years) |  | 2 years |
Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Maximum amortization period for deferred operation and maintenance costs |  | 18 months |
Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | $ 179 | 326
Regulatory assets-non-current |  | 770 | 667
Total regulatory assets |  | 949 | 993
Regulatory assets represented past expenditures not earning return |  | 230 |
Dominion Gas Holdings, LLC |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 26 | 23
Regulatory assets-non-current |  | 577 | 449
Total regulatory assets |  | 603 | 472
Regulatory assets represented past expenditures not earning return |  | 31 |
Deferred nuclear refueling outage costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [1] | 71 | 75
Deferred nuclear refueling outage costs | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [1] | 71 | 75
Deferred rate adjustment clause costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [2] | 63 | 90
Regulatory assets-non-current | [2] | 329 | 295
Deferred rate adjustment clause costs | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [2] | 51 | 80
Regulatory assets-non-current | [2] | 246 | 213
Deferred rate adjustment clause costs | Dominion Gas Holdings, LLC |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [2] | 12 | 10
Regulatory assets-non-current | [2] | 79 | 82
Unrecovered gas costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [3] | 19 | 12
Unrecovered gas costs | Dominion Gas Holdings, LLC |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [3] | 12 | 11
Deferred cost of fuel used in electric generation |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [4] | 0 | 111
Deferred cost of fuel used in electric generation | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current | [4] | 0 | 111
Unrecognized pension and other postretirement benefit costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [5] | 1,401 | 1,015
Unrecognized pension and other postretirement benefit costs | Dominion Gas Holdings, LLC |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [5] | 358 | 282
PJM transmission rates |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [6] | 192 | 192
PJM transmission rates | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [6] | 192 | 192
Derivatives |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [7] | 174 | 110
Derivatives | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [7] | 133 | 110
Income taxes recoverable through future rates |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [8] | 123 | 126
Income taxes recoverable through future rates | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [8] | 76 | 97
Income taxes recoverable through future rates | Dominion Gas Holdings, LLC |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [8] | 23 | 20
Utility reform legislation |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [9] | 99 | 65
Utility reform legislation | Dominion Gas Holdings, LLC |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-non-current | [9] | 99 | 65
Other |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 91 | 63
Regulatory assets-non-current |  | 155 | 62
Other | Virginia Electric and Power Company |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 57 | 60
Regulatory assets-non-current |  | 123 | 55
Other | Dominion Gas Holdings, LLC |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 2 | 2
Regulatory assets-non-current |  | $ 18 | $ 0
[1] | Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months.
[2] | Primarily reflects deferrals under the electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects for Virginia Power and deferrals of costs associated with certain current and prospective rider projects for Dominion Gas. See Note 13 for more information.
[3] | Reflects unrecovered gas costs at regulated gas operations, which are recovered through filings with the applicable regulatory authority.
[4] | 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.
[5] | Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered through future rates generally over the expected remaining service period of plan participants by certain of Dominion’s and Dominion Gas' rate-regulated subsidiaries.
[6] | Reflects amount related to the PJM transmission cost allocation matter. See Note 13 for more information.
[7] | 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.
[8] | Amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC-equity and depreciation of property, plant and equipment for which deferred income taxes were not recognized for ratemaking purposes, including amounts attributable to tax rate changes.
[9] | Ohio legislation under House Bill 95, which became effective in September 2011. This law updates natural gas legislation by enabling gas companies to include more up-to-date cost levels when filing rate cases. It also allows gas companies to seek approval of capital expenditure plans under which gas companies can recognize carrying costs on associated capital investments placed in service and can defer the carrying costs plus depreciation and property tax expenses for recovery from ratepayers in the future.

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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