Employee Benefit Plans - EEGH - GT&S Transaction (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Distribution of net assets			$ 699
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 14	3
Net periodic benefit cost (credit)		6	(10)	$ (11)
EEGH | MidAmerican Energy Pension Plan | Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		18	3
EEGH | MidAmerican Energy Retiree Health and Welfare Plan | Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		10	2
EEGH | BHE GT&S, LLC Defined Contribution Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contribution		$ 5	1
EEGH | Dominion Energy Pension Plan | Pension
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)			(14)	(8)
EEGH | Dominion Energy Retiree Health and Welfare Plan | Pension
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)			$ (5)	(4)
EEGH | Disposed of by Means Other than Sale | Dominion Energy Questar Pipeline
Defined Benefit Plan Disclosure [Line Items]
Distribution of net assets	$ 699
EEGH | Disposed of by Means Other than Sale | Pension Plan Asset | Dominion Energy Questar Pipeline
Defined Benefit Plan Disclosure [Line Items]
Distribution of net assets	$ 895
EEGH | Disposed of by Means Other than Sale | Dominion Energy Pension Plan | Pension
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)				(14)
EEGH | Disposed of by Means Other than Sale | Dominion Energy Retiree Health and Welfare Plan | Pension
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)				$ (1)