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Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |  |
Cash and cash equivalents | [1] | $ 462 | $ 166 |  | $ 378 | $ 268
Restricted cash and equivalents | [2],[3] | 96 | 103 |  | 62 | 123
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | 558 | 269 |  | 440 | 391
Cash and cash equivalents |  | 413 | 135 | [4] |  |
Virginia Electric and Power Company |  |  |  |  |  |
Cash Cash Equivalents And Restricted Cash [Line Items] |  |  |  |  |  |
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows |  | 63 | 24 |  | 37 | 38
Cash and cash equivalents |  | 62 | 17 | [5] | 29 | 29
Restricted cash and equivalents | [3] | $ 1 | $ 7 |  | $ 8 | $ 9
[1] | At September 30, 2020, September 30, 2019, December 31, 2019 and December 31, 2018, Dominion Energy had $49 million, $80 million, $31 million and $110 million of cash and cash equivalents included in current assets held for sale, respectively.
[2] | At September 30, 2020, September 30, 2019, December 31, 2019 and December 31, 2018, Dominion Energy had $16 million, $5 million, $12 million and $89 million of restricted cash and equivalents 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.
[4] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[5] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 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=121586364&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=121566466&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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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: 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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