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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, 2020 | Dec. 31, 2019
--- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [1] | $ 10,831 | $ 9,654
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [2] | 2,091 | 1,881
Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 4,214 | 4,271
Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,061 | 930
Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2,567 | 1,977
Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 127 | 115
Total Fair Value | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 6,781 | 6,248
Total Fair Value | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,188 | 1,045
NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 4,050 | 3,406
Cash equivalents and other | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 20 | 22
Cash equivalents and other | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  |  | 2
Cash equivalents and other | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1 | 1
Cash equivalents and other | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2 |
Cash equivalents and other | Total Fair Value | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 21 | 23
Cash equivalents and other | Total Fair Value | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2 | 2
US Equity Securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [4] | 2,405 | 2,284
US Equity Securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 817 | 719
US Equity Securities | Total Fair Value | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [4] | 2,405 | 2,284
US Equity Securities | Total Fair Value | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 817 | 719
Foreign Equity Securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,727 | 1,634
Foreign Equity Securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 240 | 206
Foreign Equity Securities | Total Fair Value | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,727 | 1,634
Foreign Equity Securities | Total Fair Value | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 240 | 206
Insurance Contracts | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 409 | 360
Insurance Contracts | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 23 | 21
Insurance Contracts | Total Fair Value | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 409 | 360
Insurance Contracts | Total Fair Value | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 23 | 21
Corporate debt instruments | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 32 | 273
Corporate debt instruments | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2 | 1
Corporate debt instruments | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,385 | 859
Corporate debt instruments | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 60 | 50
Corporate debt instruments | Total Fair Value | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 1,417 | 1,132
Corporate debt instruments | Total Fair Value | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 62 | 51
Government securities | Level 1 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 30 | 58
Government securities | Level 1 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 2 | 2
Government securities | Level 2 | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 772 | 757
Government securities | Level 2 | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 42 | 44
Government securities | Total Fair Value | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 802 | 815
Government securities | Total Fair Value | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value |  | 44 | 46
Common/collective trust funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 2,905 | 2,355
Common/collective trust funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 765 | 717
Real Estate Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 108 | 91
Real Estate Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 10 | 8
Private Equity Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 856 | 787
Private Equity Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 117 | 100
Fixed Income Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 168 | 159
Fixed Income Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 10 | 10
Hedge Funds | NAV | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 13 | 14
Hedge Funds | NAV | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recorded at fair value | [3] | 1 | 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 | [3] | $ 903 | $ 836
[1] | Excludes net assets related to pending sales of securities and advanced subscriptions of $198 million, net accrued income of $20 million, and includes net assets related to pending purchases of securities of $71 million at December 31, 2020. Excludes net assets related to pending sales of securities of $52 million, net accrued income of $24 million, and includes net assets related to pending purchases of securities of $99 million at December 31, 2019.
[2] | Excludes net assets related to pending sales of securities of $10 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $2 million at December 31, 2020. Excludes net assets related to pending sales of securities of $2 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $5 million at December 31, 2019.
[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 $365 million and $508 million of Dominion Energy common stock at December 31, 2020 and 2019, respectively.

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