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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, 2021
Dec. 31, 2020
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [1] $ 11,945 $ 10,831
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [2] 2,319 2,091
Level 1 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 4,510 4,214
Level 1 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 1,164 1,061
Level 2 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 2,900 2,567
Level 2 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 140 127
Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 7,410 6,781
Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 1,304 1,188
NAV | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 4,535 4,050
Cash equivalents and other | Level 1 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 25 20
Cash equivalents and other | Level 1 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 3  
Cash equivalents and other | Level 2 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 5 1
Cash equivalents and other | Level 2 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 1 2
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 21
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 2
US Equity Securities | Level 1 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [4] 2,592 2,405
US Equity Securities | Level 1 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 898 817
US Equity Securities | Level 2 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [4] 244  
US Equity Securities | Level 2 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 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] 2,836 2,405
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 912 817
Foreign Equity Securities | Level 1 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 1,773 1,727
Foreign Equity Securities | Level 1 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 256 240
Foreign Equity Securities | Level 2 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 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 1,792 1,727
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 257 240
Insurance Contracts | Level 2 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 279 409
Insurance Contracts | Level 2 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 16 23
Insurance Contracts | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 279 409
Insurance Contracts | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 16 23
Corporate debt instruments | Level 1 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 81 32
Corporate debt instruments | Level 1 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 5 2
Corporate debt instruments | Level 2 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 1,439 1,385
Corporate debt instruments | Level 2 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 61 60
Corporate debt instruments | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 1,520 1,417
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 66 62
Government securities | Level 1 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 39 30
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 914 772
Government securities | Level 2 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 47 42
Government securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 953 802
Government securities | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value 49 44
Common/collective trust funds | NAV | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 3,010 2,905
Common/collective trust funds | NAV | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 840 765
Real Estate Funds | NAV | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 116 108
Real Estate Funds | NAV | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 13 10
Private Equity Funds | NAV | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 1,233 856
Private Equity Funds | NAV | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 152 117
Fixed Income Funds | NAV | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 162 168
Fixed Income Funds | NAV | Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 9 10
Hedge Funds | NAV | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Total recorded at fair value [3] 14 13
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] $ 1,015 $ 903
[1] 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. 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.
[2] 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. 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.
[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 $258 million of Dominion Energy preferred stock and no Dominion Energy common stock at December 31, 2021 and $365 million of Dominion Energy common stock at December 31, 2020.