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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Fair Value |  | $ 2,317 |  |
Amortized Cost, Total |  | 4,238 | $ 4,235 |
Total Unrealized Gains |  | 3,529 | 3,815 |
Total Unrealized Losses | [1] | (153) | (100) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 7,614 | 7,950 | [2]
Net assets related to pending purchases of securities |  | 1 | 35 |
Fair value of securities in an unrealized loss position |  | 1,600 | 883 |
Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Fair Value |  | 1,117 |  |
Amortized Cost, Total |  | 2,011 | 1,997 |
Total Unrealized Gains |  | 1,627 | 1,753 |
Total Unrealized Losses | [3] | (61) | (16) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 3,577 | 3,734 | [4]
Net assets related to pending purchases of securities |  | 2 | 5 |
Fair value of securities in an unrealized loss position |  | 863 | 425 |
U.S. |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [5] | 1,586 | 1,567 |
Equity securities Total Unrealized Gains | [5] | 3,498 | 3,734 |
Equity securities Total Unrealized Losses | [5] | (13) | (13) |
Equity securities Fair Value | [5] | 5,071 | 5,288 |
U.S. | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [5] | 857 | 841 |
Equity securities Total Unrealized Gains | [5] | 1,619 | 1,720 |
Equity securities Total Unrealized Losses | [5] | (12) | (11) |
Equity securities Fair Value | [5] | 2,464 | 2,550 |
Common/collective trust funds | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [6] | 150 | 168 |
Fixed income securities Total Unrealized Gains | [6] | 3 | 4 |
Fixed income securities Total Unrealized Losses | [6] | 0 | 0 |
Fixed income securities Allowance for Credit Losses | [6] | 0 | 0 |
Fixed income securities Fair Value | [6] | 153 | 172 |
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [6] | 55 | 53 |
Fixed income securities Total Unrealized Gains | [6] | 0 | 0 |
Fixed income securities Total Unrealized Losses | [6] | 0 | 0 |
Fixed income securities Allowance for Credit Losses | [6] | 0 | 0 |
Fixed income securities Fair Value | [6] | 55 | 53 |
Corporate debt instruments | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [6] | 876 | 854 |
Fixed income securities Total Unrealized Gains | [6] | 9 | 32 |
Fixed income securities Total Unrealized Losses | [6] | (45) | (5) |
Fixed income securities Allowance for Credit Losses | [6] | 0 | 0 |
Fixed income securities Fair Value | [6] | 840 | 881 |
Corporate debt instruments | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [6] | 535 | 517 |
Fixed income securities Total Unrealized Gains | [6] | 4 | 17 |
Fixed income securities Total Unrealized Losses | [6] | (30) | (3) |
Fixed income securities Allowance for Credit Losses | [6] | 0 | 0 |
Fixed income securities Fair Value | [6] | 509 | 531 |
Government Securities | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [6] | 1,358 | 1,382 |
Fixed income securities Total Unrealized Gains | [6] | 14 | 43 |
Fixed income securities Total Unrealized Losses | [6] | (48) | (7) |
Fixed income securities Allowance for Credit Losses | [6] | 0 | 0 |
Fixed income securities Fair Value | [6] | 1,324 | 1,418 |
Government Securities | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [6] | 568 | 584 |
Fixed income securities Total Unrealized Gains | [6] | 4 | 16 |
Fixed income securities Total Unrealized Losses | [6] | (19) | (2) |
Fixed income securities Allowance for Credit Losses | [6] | 0 | 0 |
Fixed income securities Fair Value | [6] | 553 | 598 |
Insurance Contracts |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total |  | 242 | 255 |
Fixed income securities Total Unrealized Gains |  | 0 | 0 |
Fixed income securities Total Unrealized Losses |  | 0 | 0 |
Fixed income securities Fair Value |  | 242 | 255 |
Cash equivalents and other |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other, Amortized Cost | [7] | 26 | 9 |
Cash equivalents and other, Total Unrealized Gains | [7] | 5 | 2 |
Cash equivalents and other, Total Unrealized Losses | [7] | (47) | (75) |
Cash equivalents and other, Allowance for Credit Losses | [7] | 0 | 0 |
Cash equivalents and other, Fair Value | [7] | (16) | (64) |
Cash equivalents and other | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other, Amortized Cost | [8] | (4) | 2 |
Cash equivalents and other, Allowance for Credit Losses | [8] | 0 | 0 |
Cash equivalents and other, Fair Value | [8] | $ (4) | $ 2 |
[1] | The fair value of securities in an unrealized loss position was $1.6 billion and $883 million at March 31, 2022 and December 31, 2021, respectively.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | The fair value of securities in an unrealized loss position was $863 million and $425 million at March 31, 2022 and December 31, 2021, respectively.
[4] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[5] | Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.
[6] | Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability. Changes in allowance for credit losses are included in other income.
[7] | Includes pending purchases of securities of $1 million and $35 million at March 31, 2022 and December 31, 2021, respectively.
[8] | Includes pending purchases of securities of $2 million at March 31, 2022, and pending sales of securities of $5 million at December 31, 2021.

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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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