Employee Benefit Plans - BHE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1
Interest cost	7	7
Expected return on plan assets	(8)	(8)
Net amortization	(1)	(1)
Net periodic benefit credit	(1)	(1)
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	26	28
Expected return on plan assets	(31)	(31)
Settlement	0	(5)
Net amortization	2	4
Net periodic benefit credit	0	0
United Kingdom | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2
Interest cost	14	14
Expected return on plan assets	(20)	(19)
Net amortization	7	6
Net periodic benefit credit	$ 2	$ 3