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Employee Benefit Plans (Fair Values of Pension and Post Retirement Plan Assets by Asset Category) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [1] | $ 8,819 | $ 8,670
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [2] | 2,045 | 1,843
Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2,227 | 2,812
Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 961 | 876
Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2,643 | 2,534
Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 147 | 138
Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 4,870 | 5,346
Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,108 | 1,014
NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 3,949 | 3,324
Cash equivalents and other | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 21 | 14
Cash equivalents and other | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 3 | 3
Cash equivalents and other | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 9 | 11
Cash equivalents and other | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1 | 1
Cash equivalents and other | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 30 | 25
Cash equivalents and other | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 4 | 4
US Equity Securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [4] | 1,145 | 1,653
US Equity Securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [5] | 757 | 685
US Equity Securities | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [4] |  | 170
US Equity Securities | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [5] |  | 10
US Equity Securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [4] | 1,145 | 1,823
US Equity Securities | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [5] | 757 | 695
Foreign Equity Securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 944 | 1,034
Foreign Equity Securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 194 | 181
Foreign Equity Securities | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2 | 5
Foreign Equity Securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 946 | 1,039
Foreign Equity Securities | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 194 | 181
Insurance Contracts | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 162 | 166
Insurance Contracts | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 10 | 10
Insurance Contracts | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 162 | 166
Insurance Contracts | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 10 | 10
Corporate debt instruments | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 74 | 65
Corporate debt instruments | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 4 | 4
Corporate debt instruments | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 750 | 805
Corporate debt instruments | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 36 | 38
Corporate debt instruments | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 824 | 870
Corporate debt instruments | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 40 | 42
Government securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 43 | 46
Government securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 3 | 3
Government securities | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,720 | 1,377
Government securities | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 100 | 79
Government securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,763 | 1,423
Government securities | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 103 | 82
Commingled funds/collective trust funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 2,012 | 1,780
Commingled funds/collective trust funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 725 | 649
Real Estate Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 67 | 66
Real Estate Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 11 | 11
Private Equity Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 1,395 | 1,284
Private Equity Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 173 | 158
Fixed Income Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 236 | 192
Fixed Income Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 14 | 11
Hedge Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 239 | 2
Hedge Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 14 | 0
Investments Measured At Fair Value Including Excluding Pending Purchases Sales And Accrued Income | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | $ 937 | $ 829
[1] | Excludes net assets related to pending sales of securities of $298 million, net accrued income of $24 million, and includes net assets related to pending purchases of securities of $54 million at December 31, 2023. Excludes net assets related to pending sales of securities and advanced subscription of $177 million, net accrued income of $27 million, and includes net assets related to pending purchases of securities of $180 million at December 31, 2022.
[2] | Excludes net assets related to pending sales of securities and advanced subscription of $17 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $2 million at December 31, 2023. Excludes net assets related to pending sales of securities and advanced subscription of $10 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $10 million at December 31, 2022.
[3] | These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient are not required to be categorized in the fair value hierarchy.
[4] | No amounts of Dominion Energy preferred stock were held at December 31, 2023. Includes $170 million of Dominion Energy preferred stock at December 31, 2022.
[5] | No amounts of Dominion Energy preferred stock were held at December 31, 2023. Includes $10 million of Dominion Energy preferred stock at December 31, 2022.
[6] | These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient are not required to be categorized in the fair value hierarchy.

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