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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
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:
At December 31, |  | 2018 |  |  | 2017 |
(millions) |  |  |  |  |  |
Dominion Energy |  | $ | 35 |  |  | $ | 30 |
Virginia Power |  |  | 16 |  |  |  | 17 |
Dominion Energy Gas |  |  | 7 |  |  |  | 7 |
Reconciliation of Total Cash, Restricted Cash and Equivalents | The following table provides a reconciliation of the total cash, restricted cash and equivalents reported within the Companies’ Consolidated Balance Sheets to the corresponding amounts reported within the Companies’ Consolidated Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016:
|  | Cash, Restricted Cash and Equivalents at End/Beginning of Year |
|  | December 31, 2018 |  |  | December 31, 2017 |  |  | December 31, 2016 |  |  | December 31, 2015 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 268 |  |  | $ | 120 |  |  | $ | 261 |  |  | $ | 607 |
Restricted cash and equivalents(1) |  |  | 123 |  |  |  | 65 |  |  |  | 61 |  |  |  | 25 |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 391 |  |  | $ | 185 |  |  | $ | 322 |  |  | $ | 632 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 29 |  |  | $ | 14 |  |  | $ | 11 |  |  | $ | 18 |
Restricted cash and equivalents(1) |  |  | 9 |  |  |  | 10 |  |  |  | — |  |  |  | — |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 38 |  |  | $ | 24 |  |  | $ | 11 |  |  | $ | 18 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 10 |  |  | $ | 4 |  |  | $ | 23 |  |  | $ | 13 |
Restricted cash and equivalents(1) |  |  | 24 |  |  |  | 26 |  |  |  | 20 |  |  |  | 14 |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 34 |  |  | $ | 30 |  |  | $ | 43 |  |  | $ | 27 |
(1) | Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
Schedule of Depreciation Rates | The Companies’ average composite depreciation rates on utility property, plant and equipment are as follows:
Year Ended December 31, |  | 2018 |  |  | 2017 |  |  | 2016 |
(percent) |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 2.71 |  |  |  | 2.94 |  |  |  | 2.83 |
Transmission |  |  | 2.54 |  |  |  | 2.55 |  |  |  | 2.47 |
Distribution |  |  | 2.97 |  |  |  | 3.00 |  |  |  | 3.02 |
Storage |  |  | 2.40 |  |  |  | 2.48 |  |  |  | 2.29 |
Gas gathering and processing |  |  | 2.62 |  |  |  | 2.21 |  |  |  | 2.66 |
General and other |  |  | 4.56 |  |  |  | 4.89 |  |  |  | 4.12 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 2.71 |  |  |  | 2.94 |  |  |  | 2.83 |
Transmission |  |  | 2.52 |  |  |  | 2.54 |  |  |  | 2.36 |
Distribution |  |  | 3.31 |  |  |  | 3.32 |  |  |  | 3.32 |
General and other |  |  | 4.52 |  |  |  | 4.68 |  |  |  | 3.49 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |
Transmission |  |  | 2.45 |  |  |  | 2.40 |  |  |  | 2.43 |
Distribution |  |  | 2.41 |  |  |  | 2.42 |  |  |  | 2.55 |
Storage |  |  | 2.46 |  |  |  | 2.45 |  |  |  | 2.19 |
Gas gathering and processing |  |  | 3.07 |  |  |  | 2.42 |  |  |  | 2.58 |
General and other |  |  | 5.59 |  |  |  | 4.96 |  |  |  | 4.54 |
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 |  |  | 15-30 years |
Nonutility gas gathering and processing |  |  | 3-50 years |
LNG facility |  |  | 40 years |
General and other |  |  | 5-59 years |

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