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Employee Benefit Plans (Benefit Payments Expected Future Service) (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 407
2020 405
2021 426
2022 442
2023 465
2024-2028 2,548
Pension Benefits | Dominion Energy Gas Holdings, LLC  
Defined Benefit Plan Disclosure [Line Items]  
2019 37
2020 39
2021 40
2022 42
2023 43
2024-2028 223
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 98
2020 99
2021 99
2022 99
2023 98
2024-2028 461
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC  
Defined Benefit Plan Disclosure [Line Items]  
2019 19
2020 19
2021 19
2022 19
2023 19
2024-2028 $ 90