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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.