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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 |
Other Cash Provided By (Used In) Investing Activities | The guidance required retrospective application which resulted in adjustments to other cash provided by (used in) investing activities presented within Dominion Energy, Virginia Power and Dominion Energy Gas’ Consolidated Statements of Cash Flows for the years ended December 31, 2017, 2016 and 2015, which were previously reported as follows:
Year Ended December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |
(millions) |  |  |  |  |  |  |  |  |
Dominion Energy |  | $ | 29 |  |  | $ | 47 |  |  | $ | (71 | )
Virginia Power |  |  | (51 | ) |  |  | (33 | ) |  |  | (87 | )
Dominion Energy Gas |  |  | (23 | ) |  |  | (18 | ) |  |  | (11 | )
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, 2017, 2016 and 2015:
|  | Cash, Restricted Cash and Equivalents at End/Beginning of Year |
At December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2014 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 120 |  |  | $ | 261 |  |  | $ | 607 |  |  | $ | 318 |
Restricted cash and equivalents(1) |  |  | 65 |  |  |  | 61 |  |  |  | 25 |  |  |  | 19 |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 185 |  |  | $ | 322 |  |  | $ | 632 |  |  | $ | 337 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 14 |  |  | $ | 11 |  |  | $ | 18 |  |  | $ | 15 |
Restricted cash and equivalents(1) |  |  | 10 |  |  |  | — |  |  |  | — |  |  |  | — |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 24 |  |  | $ | 11 |  |  | $ | 18 |  |  | $ | 15 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 4 |  |  | $ | 23 |  |  | $ | 13 |  |  | $ | 9 |
Restricted cash and equivalents(1) |  |  | 26 |  |  |  | 20 |  |  |  | 14 |  |  |  | 13 |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 30 |  |  | $ | 43 |  |  | $ | 27 |  |  | $ | 22 |
(1) | Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
Other Adjustments from Operating Activities | As a result distributions from equity method investees were reclassified within the Consolidated Statements of Cash Flows between distributions from equity method affiliates and other cash used in investing activities at Dominion Energy and Dominion Energy Gas, respectively, to other adjustments from operating activities for both Dominion Energy and Dominion Energy Gas, which were previously reported as follows:
Year Ended December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |
(millions) |  |  |  |  |  |  |  |  |
Dominion Energy |  | $ | (37 | ) |  | $ | (108 | ) |  | $ | (42 | )
Dominion Energy Gas |  |  | (9 | ) |  |  | (6 | ) |  |  | 16 |
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 |
Other Operations and Maintenance Expense and Other Income | As previously reported, Dominion Energy and Dominion Energy Gas’ other operations and maintenance expense and other income were as follows:
Year Ended December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |
(millions) |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance expense |  | $ | 2,875 |  |  | $ | 3,064 |  |  | $ | 2,595 |
Other income |  |  | 165 |  |  |  | 250 |  |  |  | 196 |
Dominion Energy Gas |  |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance expense |  |  | 440 |  |  |  | 393 |  |  |  | 326 |
Other income |  |  | 20 |  |  |  | 11 |  |  |  | 1 |

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