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Employee Benefit Plans (Summary of Changes in Pension and Other Postretirement Benefit Plans) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amounts recognized in the Consolidated Balance Sheets at December 31:      
Noncurrent pension and other postretirement benefit assets $ 2,240 $ 1,779  
Pension Benefits      
Changes in benefit obligation:      
Benefit obligation at beginning of year 8,431 8,066  
Service cost $ 83 $ 96 $ 142
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Interest cost $ 431 $ 442 $ 333
Benefits paid (504) (493)  
Actuarial (gain) loss during the year (404) 322  
Plan amendments 30 2  
Settlements and curtailments [1] (415) (4)  
Benefit obligation at end of year 7,652 8,431 8,066
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 9,087 8,694  
Actual return gain (loss) on plan assets 503 882  
Employer contributions 76 8  
Benefits paid (504) (493)  
Settlements [2] (684) (4)  
Fair value of plan assets at end of year 8,478 9,087 8,694
Funded status at end of year 826 656  
Amounts recognized in the Consolidated Balance Sheets at December 31:      
Noncurrent pension and other postretirement benefit assets 883 647  
Assets held for sale   308  
Other current liabilities (7) (27)  
Noncurrent pension and other postretirement benefit liabilities [3] (50) (237)  
Liabilities held for sale   (35)  
Net amount recognized $ 826 $ 656  
Significant assumptions used to determine benefit obligations as of December 31:      
Weighted average rate of increase for compensation 4.40% 4.28%  
Pension Benefits | Minimum      
Significant assumptions used to determine benefit obligations as of December 31:      
Discount rate 5.84% 5.37%  
Crediting interest rate for cash balance and similar plans 4.59% 4.12%  
Pension Benefits | Maximum      
Significant assumptions used to determine benefit obligations as of December 31:      
Discount rate 5.87% 5.47%  
Crediting interest rate for cash balance and similar plans 4.62% 4.22%  
Other Postretirement Benefits      
Changes in benefit obligation:      
Benefit obligation at beginning of year $ 1,109 $ 1,127  
Service cost $ 11 $ 14 $ 22
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Interest cost $ 57 $ 61 $ 45
Benefits paid (88) (94)  
Actuarial (gain) loss during the year (43) 1  
Settlements and curtailments [1] (28)    
Benefit obligation at end of year 1,018 1,109 1,127
Changes in fair value of plan assets:      
Fair value of plan assets at beginning of year 2,062 1,845  
Actual return gain (loss) on plan assets 235 277  
Benefits paid (54) (60)  
Settlements [2] (40)    
Fair value of plan assets at end of year 2,203 2,062 $ 1,845
Funded status at end of year 1,185 953  
Amounts recognized in the Consolidated Balance Sheets at December 31:      
Noncurrent pension and other postretirement benefit assets 1,356 1,132  
Assets held for sale   13  
Other current liabilities (13) (13)  
Noncurrent pension and other postretirement benefit liabilities [3] (158) (179)  
Net amount recognized $ 1,185 $ 953  
Other Postretirement Benefits | Minimum      
Significant assumptions used to determine benefit obligations as of December 31:      
Discount rate 5.83% 5.40%  
Other Postretirement Benefits | Maximum      
Significant assumptions used to determine benefit obligations as of December 31:      
Discount rate 5.86% 5.42%  
[1] 2024 amounts include settlements and curtailment related to the East Ohio and Questar Gas Transactions. Additionally, 2024 and 2023 amounts include settlements of nonqualified pension obligations.
[2] 2024 amounts include settlements related to the East Ohio and Questar Gas Transactions. Additionally, 2024 and 2023 include amounts related to settlements of nonqualified pension obligations.
[3] Presented within other deferred credits and other liabilities in Dominion Energy's Consolidated Balance Sheets.