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Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |  |
Cash and cash equivalents | [1] | $ 446 | $ 283 |  | $ 491 | $ 179
Cash and cash equivalents |  | 444 | 283 | [2] |  |
Restricted cash and equivalents | [3],[4] | 148 | 125 |  | 71 | 68
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | 594 | 408 |  | 562 | 247
Virginia Electric and Power Company |  |  |  |  |  |
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 36 | 26 | [5] | 56 | 35
Restricted cash and equivalents | [4] | 0 | 0 |  | 0 | 0
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | $ 36 | $ 26 |  | $ 56 | $ 35
[1] | At March 31, 2022, March 31, 2021 and December 31, 2020, Dominion Energy had $2 million, $14 million and $7 million of cash and cash equivalents included in current assets held for sale, respectively. No amounts were included in current assets held for sale at December 31, 2021.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | At March 31, 2021 and December 31, 2020, Dominion Energy had $3 million of restricted cash and equivalents included in current assets held for sale. No amounts were included in current assets held for sale at March 31, 2022 and December 31, 2021.
[4] | Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
[5] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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