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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed income securities Fair Value |  | $ 2,211 |
Cash equivalents and other, Amortized Cost | [1] | 65 | $ 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] | 65 | 84
Amortized Cost, Total |  | 3,828 | 3,699
Total Unrealized Gains |  | 4,281 | 3,308
Total Unrealized Losses | [2] | (58) | (61)
Allowance for Credit Losses, Total |  | 0 | 0
Fair Value, Total |  | 8,051 | 6,946
Fair value of securities in an unrealized loss position |  | 1,400 | 764
Net assets related to pending sale of securities |  | 35 | 49
Virginia Electric and Power Company |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed income securities Fair Value |  | 1,318 |
Cash equivalents and other, Amortized Cost | [1] | 22 | 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] | 22 | 47
Amortized Cost, Total |  | 2,092 | 2,033
Total Unrealized Gains |  | 2,227 | 1,726
Total Unrealized Losses | [2] | (33) | (43)
Allowance for Credit Losses, Total |  | 0 | 0
Fair Value, Total |  | 4,286 | 3,716
Fair value of securities in an unrealized loss position |  | 796 | 384
Net assets related to pending sale of securities |  | 22 | 27
Corporate Debt Fixed Income Securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed income securities Amortized Cost, Total | [3] | 516 | 508
Fixed income securities Total Unrealized Gains | [3] | 6 | 10
Fixed income securities Total Unrealized Losses | [3] | (15) | (27)
Fixed income securities Allowance for Credit Losses | [3] | 0 | 0
Fixed income securities Fair Value | [3] | 507 | 491
Corporate Debt Fixed Income Securities | Virginia Electric and Power Company |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed income securities Amortized Cost, Total | [3] | 303 | 292
Fixed income securities Total Unrealized Gains | [3] | 3 | 3
Fixed income securities Total Unrealized Losses | [3] | (12) | (21)
Fixed income securities Allowance for Credit Losses | [3] | 0 | 0
Fixed income securities Fair Value | [3] | 294 | 274
Government Debt Fixed Income Securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed income securities Amortized Cost, Total | [3] | 1,736 | 1,426
Fixed income securities Total Unrealized Gains | [3] | 7 | 28
Fixed income securities Total Unrealized Losses | [3] | (39) | (24)
Fixed income securities Allowance for Credit Losses | [3] | 0 | 0
Fixed income securities Fair Value | [3] | 1,704 | 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 | [3] | 1,038 | 811
Fixed income securities Total Unrealized Gains | [3] | 4 | 17
Fixed income securities Total Unrealized Losses | [3] | (18) | (12)
Fixed income securities Allowance for Credit Losses | [3] | 0 | 0
Fixed income securities Fair Value | [3] | 1,024 | 816
Insurance Contracts |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed income securities Amortized Cost, Total | [4] | 239 | 244
Fixed income securities Total Unrealized Gains | [4] | 0 | 0
Fixed income securities Total Unrealized Losses | [4] | 0 | 0
Fixed income securities Fair Value | [4] | 239 | 244
U.S. |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Equity securities Amortized Cost | [5] | 1,220 | 1,276
Equity securities Total Unrealized Gains | [5] | 4,157 | 3,270
Equity securities Total Unrealized Losses | [5] | (4) | (10)
Equity securities Fair Value | [5] | 5,373 | 4,536
U.S. | Virginia Electric and Power Company |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Equity securities Amortized Cost | [5] | 695 | 759
Equity securities Total Unrealized Gains | [5] | 2,155 | 1,706
Equity securities Total Unrealized Losses | [5] | (3) | (10)
Equity securities Fair Value | [5] | 2,847 | 2,455
International |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Equity securities Amortized Cost | [5] | 52 |
Equity securities Total Unrealized Gains | [5] | 111 |
Equity securities Fair Value | [5] | 163 |
International | Virginia Electric and Power Company |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Equity securities Amortized Cost | [5] | 34 |
Equity securities Total Unrealized Gains | [5] | 65 |
Equity securities Fair Value | [5] | $ 99 |
Common/collective trust funds | Fixed Income |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fixed income securities Amortized Cost, Total | [3] |  | 161
Fixed income securities Total Unrealized Gains | [3] |  | 0
Fixed income securities Total Unrealized Losses | [3] |  | 0
Fixed income securities Allowance for Credit Losses | [3] |  | 0
Fixed income securities Fair Value | [3] |  | 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 | [3] |  | 124
Fixed income securities Total Unrealized Gains | [3] |  | 0
Fixed income securities Total Unrealized Losses | [3] |  | 0
Fixed income securities Allowance for Credit Losses | [3] |  | 0
Fixed income securities Fair Value | [3] |  | $ 124
[1] | Dominion Energy includes pending sales of securities of $35 million and $49 million at December 31, 2024 and 2023, respectively. Virginia Power includes pending sales of securities of $22 million and $27 million at December 31, 2024 and 2023, respectively.
[2] | Dominion Energy’s fair value of securities in an unrealized loss position was $1.4 billion and $764 million at December 31, 2024 and 2023, respectively. Virginia Power’s fair value of securities in an unrealized loss position was $796 million and $384 million at December 31, 2024 and 2023, respectively.
[3] | Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability as discussed in Note 2. Changes in allowance for credit losses are included in other income (expense)
[4] | Includes company owned life insurance contracts measured at cash surrender value.
[5] | Unrealized gains and losses on equity securities are included in other income (expense) and the nuclear decommissioning trust regulatory liability as discussed in Note 2.

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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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