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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, 2022 | Dec. 31, 2021
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Fair Value |  | $ 1,816 |  |
Amortized Cost, Total |  | 3,604 | $ 4,235 |
Total Unrealized Gains |  | 2,210 | 3,815 |
Total Unrealized Losses | [1] | (224) | (100) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 5,590 | 7,950 | [2]
Net assets related to pending sales of securities |  | 13 |  |
Net assets related to pending purchases of securities |  |  | 35 |
Fair value of securities in an unrealized loss position |  | 1,900 | 883 |
Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Fair Value |  | 1,023 |  |
Amortized Cost, Total |  | 1,995 | 1,997 |
Total Unrealized Gains |  | 1,151 | 1,753 |
Total Unrealized Losses | [3] | (142) | (16) |
Allowance for Credit Losses, Total |  | 0 | 0 |
Fair Value, Total |  | 3,004 | 3,734 | [4]
Net assets related to pending sales of securities |  | 6 | 5 |
Fair value of securities in an unrealized loss position |  | 1,100 | 425 |
Corporate Debt Fixed Income Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 649 | 854 |
Fixed income securities Total Unrealized Gains | [5] | 0 | 32 |
Fixed income securities Total Unrealized Losses | [5] | (86) | (5) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 563 | 881 |
Corporate Debt Fixed Income Securities | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 434 | 517 |
Fixed income securities Total Unrealized Gains | [5] | 0 | 17 |
Fixed income securities Total Unrealized Losses | [5] | (62) | (3) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 372 | 531 |
Government Debt Fixed Income Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 1,291 | 1,382 |
Fixed income securities Total Unrealized Gains | [5] | 1 | 43 |
Fixed income securities Total Unrealized Losses | [5] | (101) | (7) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 1,191 | 1,418 |
Government Debt Fixed Income Securities | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 654 | 584 |
Fixed income securities Total Unrealized Gains | [5] | 0 | 16 |
Fixed income securities Total Unrealized Losses | [5] | (48) | (2) |
Fixed income securities Allowance for Credit Losses | [5] | 0 | 0 |
Fixed income securities Fair Value | [5] | 606 | 598 |
Insurance Contracts |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total |  | 214 | 255 |
Fixed income securities Total Unrealized Gains |  | 0 | 0 |
Fixed income securities Total Unrealized Losses |  | 0 | 0 |
Fixed income securities Fair Value |  | 214 | 255 |
U.S. |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [6] | 1,375 | 1,567 |
Equity securities Total Unrealized Gains | [6] | 2,209 | 3,734 |
Equity securities Total Unrealized Losses | [6] | (37) | (13) |
Equity securities Fair Value | [6] | 3,547 | 5,288 |
U.S. | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [6] | 856 | 841 |
Equity securities Total Unrealized Gains | [6] | 1,151 | 1,720 |
Equity securities Total Unrealized Losses | [6] | (32) | (11) |
Equity securities Fair Value | [6] | 1,975 | 2,550 |
Common/collective trust funds | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 62 | 168 |
Fixed income securities Total Unrealized Gains | [5] | 0 | 4 |
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] | 62 | 172 |
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [5] | 45 | 53 |
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] | 45 | 53 |
Cash equivalents and other |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other, Amortized Cost | [7] | 13 | 9 |
Cash equivalents and other, Total Unrealized Gains | [7] |  | 2 |
Cash equivalents and other, Total Unrealized Losses | [7] |  | (75) |
Cash equivalents and other, Allowance for Credit Losses | [7] | 0 | 0 |
Cash equivalents and other, Fair Value | [7] | 13 | (64) |
Cash equivalents and other | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other, Amortized Cost | [8] | 6 | 2 |
Cash equivalents and other, Allowance for Credit Losses | [8] | 0 | 0 |
Cash equivalents and other, Fair Value | [8] | $ 6 | $ 2 |
[1] | The fair value of securities in an unrealized loss position was $1.9 billion and $883 million at September 30, 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 $1.1 billion and $425 million at September 30, 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 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.
[6] | Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.
[7] | Includes pending sales of securities of $13 million at September 30, 2022, and pending purchases of securities of $35 million at December 31, 2021.
[8] | Includes pending sales of securities of $6 million and $5 million at September 30, 2022 and December 31, 2021, respectively.

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