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Employee Benefit Plans (Benefit Payments Expected Future Service) (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 535
2021 472
2022 511
2023 519
2024 536
2025-2029 2,792
Pension Benefits | Dominion Energy Gas Holdings, LLC  
Defined Benefit Plan Disclosure [Line Items]  
2020 15
2021 15
2022 15
2023 15
2024 15
2025-2029 79
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 120
2021 117
2022 116
2023 114
2024 113
2025-2029 528
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC  
Defined Benefit Plan Disclosure [Line Items]  
2020 8
2021 8
2022 8
2023 8
2024 8
2025-2029 $ 36