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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of Checks Outstanding but Not Yet Presented for Payment | The following table illustrates the checks outstanding but not yet presented for payment and recorded in accounts payable for the Companies:
Year Ended December 31, |  | 2017 |  |  | 2016 |
(millions) |  |  |  |  |  |
Dominion Energy |  | $ | 30 |  |  | $ | 24 |
Virginia Power |  |  | 17 |  |  |  | 11 |
Dominion Energy Gas |  |  | 7 |  |  |  | 9 |
Amount of Restricted Cash Held at each Company | The Companies hold restricted cash and cash equivalent balances that primarily consist of amounts held for customer deposits, future debt payments on Dominion Solar Projects III, Inc.’s term loan agreement and a distribution reserve at Cove Point. The amount of restricted cash held at each company is presented in the table below. These balances are presented in Other Current Assets and Other Investments in the Consolidated Balance Sheets.
Year Ended December 31, |  | 2017 |  |  | 2016 |
(millions) |  |  |  |  |  |
Dominion Energy |  | $ | 65 |  |  | $ | 61 |
Virginia Power |  |  | 10 |  |  |  | — |
Dominion Energy Gas |  |  | 26 |  |  |  | 20 |
Schedule of Depreciation Rates | The Companies’ average composite depreciation rates on utility property, plant and equipment are as follows:
Year Ended December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |
(percent) |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 2.94 |  |  |  | 2.83 |  |  |  | 2.78 |
Transmission |  |  | 2.55 |  |  |  | 2.47 |  |  |  | 2.42 |
Distribution |  |  | 3.00 |  |  |  | 3.02 |  |  |  | 3.11 |
Storage |  |  | 2.48 |  |  |  | 2.29 |  |  |  | 2.42 |
Gas gathering and processing |  |  | 2.21 |  |  |  | 2.66 |  |  |  | 3.19 |
General and other |  |  | 4.89 |  |  |  | 4.12 |  |  |  | 3.67 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 2.94 |  |  |  | 2.83 |  |  |  | 2.78 |
Transmission |  |  | 2.54 |  |  |  | 2.36 |  |  |  | 2.33 |
Distribution |  |  | 3.32 |  |  |  | 3.32 |  |  |  | 3.33 |
General and other |  |  | 4.68 |  |  |  | 3.49 |  |  |  | 3.40 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |
Transmission |  |  | 2.40 |  |  |  | 2.43 |  |  |  | 2.46 |
Distribution |  |  | 2.42 |  |  |  | 2.55 |  |  |  | 2.45 |
Storage |  |  | 2.45 |  |  |  | 2.19 |  |  |  | 2.44 |
Gas gathering and processing |  |  | 2.42 |  |  |  | 2.58 |  |  |  | 3.20 |
General and other |  |  | 4.96 |  |  |  | 4.54 |  |  |  | 4.72 |
Property, Plant and Equipment | Dominion Energy’s nonutility property, plant and equipment is depreciated using the straight-line method over the following estimated useful lives:
Asset |  | Estimated Useful Lives |
Merchant generation-nuclear |  |  | 44 years |
Merchant generation-other |  |  | 15-40 years |
Nonutility gas gathering and processing |  |  | 3-50 years |
General and other |  |  | 5-59 years |

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