Summary of Significant Accounting Policies - BHE - Schedule of Allowance for Credit Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 77	$ 44	$ 42
Charged to operating costs and expenses, net	81	56	47
Acquisitions	0	5	0
Write-offs, net	(50)	(28)	(45)
Ending balance	$ 108	$ 77	$ 44