Related Party Transactions - MidAmerican Funding (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 11,030	$ 9,412
Related Party Transaction, Cash Received for Income Taxes, Net		1,504	942	$ 884
MidAmerican Funding, LLC and Subsidiaries [Member]
Related Party Transaction [Line Items]
Notes Payable, Related Parties, Current		$ 177	171
Maximum Debt to Capitalization Ratio		0.67
Minumum Interest Coverage Ratio		2.2
MidAmerican Funding, LLC and Subsidiaries [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expense Reimbursement		$ 46	41	44
Due from Affiliate, Current		13	7
Accounts payable to affiliates		13	11
Affiliated notes receivable		146	23
Due to Affiliate, Noncurrent		49	47
MidAmerican Funding, LLC and Subsidiaries [Member] | BHE [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Proceeds From Transfer of Asset				15
Related Party Transaction, Expenses from Transactions with Related Party		15	14	11
Income Taxes Receivable From (Payable To) Related Parties Current		(14)	(83)
Related Party Transaction, Cash Received for Income Taxes, Net		715	456	511
MidAmerican Funding, LLC and Subsidiaries [Member] | Northern Natural Gas and BNSF Railway Company [Member]
Related Party Transaction [Line Items]
Purchases from Related Party		129	139	$ 127
MidAmerican Funding, LLC and Subsidiaries [Member] | BHE Renewables [Member]
Related Party Transaction [Line Items]
Purchases from Related Party		7
MidAmerican Funding, LLC and Subsidiaries [Member] | Revolving Credit Arrangement, $300 million [Member] | Line of Credit [Member] | MHC, Inc. [Member] | BHE [Member]
Related Party Transaction [Line Items]
Line of Credit Arrangement Offered to Affiliate, Maximum Amount Available		300
Notes Payable, Related Parties, Current		$ 177	$ 171
Debt, Weighted Average Interest Rate		0.397%	1.944%
MidAmerican Funding, LLC and Subsidiaries [Member] | Revolving Credit Arrangement, $100 million [Member] | Line of Credit [Member] | MHC, Inc. [Member] | BHE [Member]
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Notes Receivable, Related Parties, Current		$ 0	$ 0
Property, Plant and Equipment [Member] | MidAmerican Funding, LLC and Subsidiaries [Member]
Related Party Transaction [Line Items]
Dividend, Noncash, Transfer Of Asset			$ 8

[1] The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.