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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Fair Value |  | $ 2,276 |  |
Cash equivalents and other, Amortized Cost | [1] | 43 | $ 84 |
Cash equivalents and other, Total Unrealized Gains | [1] | 0 | 0 |
Cash equivalents and other, Total Unrealized Losses | [1] | 0 | 0 |
Cash equivalents and other, Allowance for Credit Losses | [1] | 0 | 0 |
Cash equivalents and other, Fair Value | [1] | 43 | 84 |
Amortized Cost, Total |  | 3,811 | 3,699 |
Total Unrealized Gains |  | 4,240 | 3,308 |
Total Unrealized Losses | [2] | (34) | (61) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 8,017 | 6,946 | [3]
Net assets related to pending sales of securities |  | 21 | 49 |
Fair value of securities in an unrealized loss position |  | 474 | 764 |
Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Fair Value |  | 1,359 |  |
Cash equivalents and other, Amortized Cost | [1] | 13 | 47 |
Cash equivalents and other, Total Unrealized Gains | [1] | 0 | 0 |
Cash equivalents and other, Total Unrealized Losses | [1] | 0 | 0 |
Cash equivalents and other, Allowance for Credit Losses | [1] | 0 | 0 |
Cash equivalents and other, Fair Value | [1] | 13 | 47 |
Amortized Cost, Total |  | 2,088 | 2,033 |
Total Unrealized Gains |  | 2,201 | 1,726 |
Total Unrealized Losses | [2] | (23) | (43) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 4,266 | 3,716 | [4]
Net assets related to pending sales of securities |  | 11 | 27 |
Fair value of securities in an unrealized loss position |  | 262 | 384 |
Corporate Debt Fixed Income Securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 569 | 508 |
Fixed income securities Total Unrealized Gains | [5] | 17 | 10 |
Fixed income securities Total Unrealized Losses | [5] | (17) | (27) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 569 | 491 |
Corporate Debt Fixed Income Securities | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 357 | 292 |
Fixed income securities Total Unrealized Gains | [5] | 8 | 3 |
Fixed income securities Total Unrealized Losses | [5] | (14) | (21) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 351 | 274 |
Government Debt Fixed Income Securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 1,549 | 1,426 |
Fixed income securities Total Unrealized Gains | [5] | 42 | 28 |
Fixed income securities Total Unrealized Losses | [5] | (15) | (24) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 1,576 | 1,430 |
Government Debt Fixed Income Securities | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 894 | 811 |
Fixed income securities Total Unrealized Gains | [5] | 25 | 17 |
Fixed income securities Total Unrealized Losses | [5] | (7) | (12) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 912 | 816 |
Other |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 131 |  |
Fixed income securities Total Unrealized Gains | [5] | 0 |  |
Fixed income securities Total Unrealized Losses | [5] | 0 |  |
Fixed income securities Allowance for Credit Losses | [5] | 0 |  |
Fixed income securities Fair Value | [5] | 131 |  |
Other | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 96 |  |
Fixed income securities Total Unrealized Gains | [5] | 0 |  |
Fixed income securities Total Unrealized Losses | [5] | 0 |  |
Fixed income securities Allowance for Credit Losses | [5] | 0 |  |
Fixed income securities Fair Value | [5] | 96 |  |
Insurance Contracts |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 252 | 244 |
Fixed income securities Total Unrealized Gains | [5] | 0 | 0 |
Fixed income securities Total Unrealized Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 252 | 244 |
U.S. |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Equity securities Amortized Cost | [6] | 1,267 | 1,276 |
Equity securities Total Unrealized Gains | [6] | 4,181 | 3,270 |
Equity securities Total Unrealized Losses | [6] | (2) | (10) |
Equity securities Fair Value | [6] | 5,446 | 4,536 |
U.S. | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Equity securities Amortized Cost | [6] | 728 | 759 |
Equity securities Total Unrealized Gains | [6] | 2,168 | 1,706 |
Equity securities Total Unrealized Losses | [6] | (2) | (10) |
Equity securities Fair Value | [6] | 2,894 | 2,455 |
Common/collective trust funds | Fixed Income |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 0 | 161 |
Fixed income securities Total Unrealized Gains | [5] | 0 | 0 |
Fixed income securities Total Unrealized Losses | [5] | 0 | 0 |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 0 | 161 |
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 0 | 124 |
Fixed income securities Total Unrealized Gains | [5] | 0 | 0 |
Fixed income securities Total Unrealized Losses | [5] | 0 | 0 |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | $ 0 | $ 124 |
[1] | Dominion Energy includes pending sales of securities of $21 million and $49 million at September 30, 2024 and December 31, 2023, respectively. Virginia Power includes pending sales of securities of $11 million and $27 million at September 30, 2024, and December 31, 2023, respectively.
[2] | Dominion Energy’s fair value of securities in an unrealized loss position was $474 million and $764 million at September 30, 2024 and December 31, 2023, respectively. Virginia Power’s fair value of securities in an unrealized loss position was $262 million and $384 million at September 30, 2024 and December 31, 2023, respectively.
[3] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[5] | 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 (expense).
[6] | Unrealized gains and losses on equity securities are included in other income (expense) and the nuclear decommissioning trust regulatory liability.

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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