Employee Benefit Plans - BHE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 2
Interest cost	7	5
Expected return on plan assets	(8)	(7)
Net amortization	(1)	0
Net periodic benefit (credit) cost	(1)	0
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	7
Interest cost	28	19
Expected return on plan assets	(31)	(27)
Settlement	(5)	2
Net amortization	4	4
Net periodic benefit (credit) cost	0	5
United Kingdom | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	4
Interest cost	14	10
Expected return on plan assets	(19)	(25)
Net amortization	6	6
Net periodic benefit (credit) cost	$ 3	$ (5)