Summary of Significant Accounting Policies - BHE - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for Doubtful Accounts(1) [Line Items]
Inventory, other fossil fuel	$ 422	$ 250
Inventory, raw materials and supplies, gross	1,540	1,259
Replacement cost of inventory, higher (lower)	18	4
Goodwill impairment	0	0	$ 0
Unbilled revenue	807	787
MEC
Allowance for Doubtful Accounts(1) [Line Items]
Inventory, raw materials and supplies, gross	249	240
Replacement cost of inventory, higher (lower)	18	4
Unbilled revenue	$ 109	$ 97