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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, 2022 | Dec. 31, 2021
--- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [1] | $ 8,670 | $ 11,945
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [2] | 1,843 | 2,319
Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2,812 | 4,510
Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 876 | 1,164
Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2,534 | 2,900
Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 138 | 140
Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 5,346 | 7,410
Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,014 | 1,304
NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 3,324 | 4,535
Cash equivalents and other | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 14 | 25
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 |  | 11 | 5
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 |  | 25 | 30
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] | 1,653 | 2,592
US Equity Securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [5] | 685 | 898
US Equity Securities | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [4] | 170 | 244
US Equity Securities | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [5] | 10 | 14
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] | 1,823 | 2,836
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] | 695 | 912
Foreign Equity Securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,034 | 1,773
Foreign Equity Securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 181 | 256
Foreign Equity Securities | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 5 | 19
Foreign Equity Securities | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  |  | 1
Foreign Equity Securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,039 | 1,792
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 |  | 181 | 257
Insurance Contracts | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 166 | 279
Insurance Contracts | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 10 | 16
Insurance Contracts | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 166 | 279
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 | 16
Corporate debt instruments | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 65 | 81
Corporate debt instruments | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 4 | 5
Corporate debt instruments | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 805 | 1,439
Corporate debt instruments | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 38 | 61
Corporate debt instruments | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 870 | 1,520
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 |  | 42 | 66
Government securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 46 | 39
Government securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 3 | 2
Government securities | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,377 | 914
Government securities | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 79 | 47
Government securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,423 | 953
Government securities | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 82 | 49
Common/collective trust funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 1,780 | 3,010
Common/collective trust funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 649 | 840
Real Estate Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 66 | 116
Real Estate Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 11 | 13
Private Equity Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 1,284 | 1,233
Private Equity Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 158 | 152
Fixed Income Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 192 | 162
Fixed Income Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] | 11 | 9
Hedge Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 2 | 14
Hedge Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [6] |  | 1
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] | $ 829 | $ 1,015
[1] | 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. Excludes net assets related to pending sales of securities of $35 million, net accrued income of $27 million, and includes net assets related to pending purchases of securities of $62 million at December 31, 2021.
[2] | 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. Excludes net assets related to pending sales of securities of $5 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $3 million at December 31, 2021.
[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] | Includes $170 million and $258 million of Dominion Energy preferred stock at December 31, 2022 and 2021, respectively.
[5] | 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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