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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, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Fair Value |  | $ 1,807 |  |
Amortized Cost, Total |  | 3,660 | $ 3,632 |
Total Unrealized Gains |  | 2,860 | 2,506 |
Total Unrealized Losses | [1] | (175) | (181) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 6,345 | 5,957 | [2]
Net assets related to pending sales of securities |  | 39 | 42 |
Fair value of securities in an unrealized loss position |  | 1,900 | 1,600 |
Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Fair Value |  | 1,025 |  |
Amortized Cost, Total |  | 2,026 | 2,012 |
Total Unrealized Gains |  | 1,490 | 1,307 |
Total Unrealized Losses | [1] | (116) | (117) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 3,400 | 3,202 | [3]
Net assets related to pending sales of securities |  | 20 | 24 |
Fair value of securities in an unrealized loss position |  | 1,100 | 946 |
Corporate Debt Fixed Income Securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 545 | 640 |
Fixed income securities Total Unrealized Gains | [4] | 0 | 1 |
Fixed income securities Total Unrealized Losses | [4] | (53) | (65) |
Fixed income securities Allowance for Credit Losses | [4] | 0 | 0 |
Fixed income securities Fair Value | [4] | 492 | 576 |
Corporate Debt Fixed Income Securities | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 324 | 406 |
Fixed income securities Total Unrealized Gains | [4] | 0 | 1 |
Fixed income securities Total Unrealized Losses | [4] | (39) | (47) |
Fixed income securities Allowance for Credit Losses | [4] | 0 | 0 |
Fixed income securities Fair Value | [4] | 285 | 360 |
Government Debt Fixed Income Securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 1,340 | 1,252 |
Fixed income securities Total Unrealized Gains | [4] | 0 | 4 |
Fixed income securities Total Unrealized Losses | [4] | (91) | (70) |
Fixed income securities Allowance for Credit Losses | [4] | 0 | 0 |
Fixed income securities Fair Value | [4] | 1,249 | 1,186 |
Government Debt Fixed Income Securities | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 737 | 664 |
Fixed income securities Total Unrealized Gains | [4] | 0 | 2 |
Fixed income securities Total Unrealized Losses | [4] | (49) | (35) |
Fixed income securities Allowance for Credit Losses | [4] | 0 | 0 |
Fixed income securities Fair Value | [4] | 688 | 631 |
Insurance Contracts |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total |  | 228 | 221 |
Fixed income securities Total Unrealized Gains |  | 0 | 0 |
Fixed income securities Total Unrealized Losses |  | 0 | 0 | [4]
Fixed income securities Fair Value |  | 228 | 221 |
U.S. |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Equity securities Amortized Cost | [5] | 1,399 | 1,378 |
Equity securities Total Unrealized Gains | [5] | 2,860 | 2,501 |
Equity securities Total Unrealized Losses | [5] | (31) | (46) |
Equity securities Fair Value | [5] | 4,228 | 3,833 |
U.S. | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Equity securities Amortized Cost | [5] | 870 | 858 |
Equity securities Total Unrealized Gains | [5] | 1,490 | 1,304 |
Equity securities Total Unrealized Losses | [5] | (28) | (35) |
Equity securities Fair Value | [5] | 2,332 | 2,127 |
Common/collective trust funds | Fixed Income |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 66 | 98 |
Fixed income securities Total Unrealized Gains | [4] | 0 | 0 |
Fixed income securities Total Unrealized Losses | [4] | 0 | 0 |
Fixed income securities Allowance for Credit Losses | [4] | 0 | 0 |
Fixed income securities Fair Value | [4] | 66 | 98 |
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 52 | 61 |
Fixed income securities Total Unrealized Gains | [4] | 0 | 0 |
Fixed income securities Total Unrealized Losses | [4] | 0 | 0 |
Fixed income securities Allowance for Credit Losses | [4] | 0 | 0 |
Fixed income securities Fair Value | [4] | 52 | 61 |
Cash equivalents and other |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Cash equivalents and other, Amortized Cost | [6] | 82 | 43 |
Cash equivalents and other, Total Unrealized Gains | [6] | 0 | 0 |
Cash equivalents and other, Total Unrealized Losses | [6] | 0 | 0 |
Cash equivalents and other, Allowance for Credit Losses | [6] | 0 | 0 |
Cash equivalents and other, Fair Value | [6] | 82 | 43 |
Cash equivalents and other | Virginia Electric and Power Company |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Cash equivalents and other, Amortized Cost | [6] | 43 | 23 |
Cash equivalents and other, Total Unrealized Gains | [6] | 0 | 0 |
Cash equivalents and other, Total Unrealized Losses | [6] | 0 | 0 |
Cash equivalents and other, Allowance for Credit Losses | [6] | 0 | 0 |
Cash equivalents and other, Fair Value | [6] | $ 43 | $ 23 |
[1] | Dominion Energy's fair value of securities in an unrealized loss position was $1.9 billion and $1.6 billion at September 30, 2023 and December 31, 2022, respectively. Virginia Power's fair value of securities in an unrealized loss position was $1.1 billion and $946 million at September 30, 2023 and December 31, 2022, respectively.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date and recast for certain events as discussed in Note 1.
[3] | Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | 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).
[5] | Unrealized gains and losses on equity securities are included in other income (expense) and the nuclear decommissioning trust regulatory liability.
[6] | Dominion Energy includes pending sales of securities of $39 million and $42 million at September 30, 2023 and December 31, 2022, respectively. Virginia Power includes pending sales of securities of $20 million and $24 million at September 30, 2023, and December 31, 2022, respectively.

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