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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
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, |  | 2020 |  |  | 2019 |
(millions) |  |  |  |  |  |  |  |
Dominion Energy |  | $ | 50 |  |  | $ | 29 |
Virginia Power |  |  | 30 |  |  |  | 9 |
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, 2020, 2019 and 2018:
|  | Cash, Restricted Cash and Equivalents at End/Beginning of Year |
|  | December 31, 2020 |  |  | December 31, 2019 |  |  | December 31, 2018 |  |  | December 31, 2017 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents(1) |  | $ | 179 |  |  | $ | 166 |  |  | $ | 268 |  |  | $ | 120 |
Restricted cash and equivalents(2)(3) |  |  | 68 |  |  |  | 103 |  |  |  | 123 |  |  |  | 65 |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 247 |  |  | $ | 269 |  |  | $ | 391 |  |  | $ | 185 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 35 |  |  | $ | 17 |  |  | $ | 29 |  |  | $ | 14 |
Restricted cash and equivalents(3) |  |  | — |  |  |  | 7 |  |  |  | 9 |  |  |  | 10 |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 35 |  |  | $ | 24 |  |  | $ | 38 |  |  | $ | 24 |
| (1) | At December 31, 2020, December 31, 2019, December 31, 2018 and December 31, 2017, Dominion Energy had $7 million, $31 million, $110 million and $21 million of cash and cash equivalents included in current assets held for sale, respectively.
| (2) | At December 31, 2020, December 31, 2019, December 31, 2018 and December 31, 2017, Dominion Energy had $3 million, $12 million, $89 million and $39 million of restricted cash included in current assets held for sale, respectively.
| (3) | Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
Schedule of Supplemental Cash Flow Information | The following table provides supplemental disclosure of cash flow information related to Dominion Energy:
Year Ended December 31, |  | 2020 |  |  | 2019 |  |  | 2018 |
Cash paid during the year for: |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges, excluding capitalized amounts |  | $ | 1,519 |  |  | $ | 1,643 |  |  |  | 1,362 |
Income taxes |  |  | 292 |  |  |  | 106 |  |  |  | 89 |
Significant noncash investing and financing activities:(1)(2)(3)(4)(5) |  |  |  |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  | 485 |  |  |  | 555 |  |  |  | 307 |
Leases(6) |  |  | 173 |  |  |  | 157 |  |  |  | — |
Receivables from sales of assets and equity method investments |  |  | — |  |  |  | 5 |  |  |  | 159 |
| (1) | See the New Accounting Standards section below for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.
| (2) | See Note 3 for noncash investing and financing activities related to the SCANA Combination.
| (3) | See Note 5 for noncash activities related to the sale of a noncontrolling interest in Cove Point.
| (4) | See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Wrangler.
| (5) | See Notes 18,19 and 20 for noncash financing activities related to the acquisition of the public interest in Dominion Energy Midstream, the remarketing of RSNs, the issuance of stock purchase contracts associated with the 2019 Equity Units, the contribution of stock to Dominion Energy’s qualified defined benefit pension plan, derivative restructuring and the issuance of common stock associated with the settlement of litigation. See Note 23 for non-cash investing activities related to property, plant and equipment conveyed to satisfy litigation.
| (6) | Includes $46 million of finance leases and $127 million of operating leases at December 31, 2020 and $113 million of finance leases and $44 million of operating leases at December 31, 2019.
The following table provides supplemental disclosure of cash flow information related to Virginia Power:
Year Ended December 31, |  | 2020 |  |  | 2019 |  |  | 2018 |
Cash paid during the year for: |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges, excluding capitalized amounts |  | $ | 491 |  |  | $ | 495 |  |  | $ | 498 |
Income taxes |  |  | 452 |  |  |  | 272 |  |  |  | 128 |
Significant noncash investing activities:(1), (2) |  |  |  |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  | 262 |  |  |  | 292 |  |  |  | 204 |
Leases (3) |  |  | 32 |  |  |  | 55 |  |  |  | — |
(1) | See the New Accounting Standards section below for noncash investing and financing activities related to the adoption of a new accounting standard for leasing arrangements.
(2) | See Note 18 for non-cash financing activities related to derivative restructuring.
(3) | Includes $32 million of finance leases as of December 31, 2020 and $20 million of finance leases and $35 million of operating leases as of December 31, 2019.
Schedule of Depreciation Rates | The Companies’ average composite depreciation rates on utility property, plant and equipment are as follows:
Year Ended December 31, |  | 2020 |  |  | 2019 |  |  | 2018 |
(percent) |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy(1) |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 2.51 |  |  |  | 2.84 |  |  |  | 2.71 |
Transmission |  |  | 2.48 |  |  |  | 2.50 |  |  |  | 2.50 |
Distribution |  |  | 2.76 |  |  |  | 2.80 |  |  |  | 2.97 |
Storage |  |  | 1.59 |  |  |  | 1.49 |  |  |  | 2.20 |
General and other |  |  | 4.35 |  |  |  | 3.99 |  |  |  | 4.11 |
Virginia Power |  |  |  |  |  |  |  |  |  |  |  |
Generation |  |  | 2.52 |  |  |  | 2.94 |  |  |  | 2.71 |
Transmission |  |  | 2.52 |  |  |  | 2.54 |  |  |  | 2.52 |
Distribution |  |  | 3.19 |  |  |  | 3.14 |  |  |  | 3.31 |
General and other |  |  | 5.09 |  |  |  | 4.40 |  |  |  | 4.52 |
(1) | Excludes rates for depreciation reported as discontinued operations.
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
Nonregulated generation-nuclear |  | 44 years
Nonregulated generation-other |  | 15-30 years
General and other |  | 5-59 years

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