Cash and Cash Equivalents and Restricted Cash and Cash Equivalents - LLC (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 2,047	$ 1,591
Restricted cash and cash equivalents, current	283	173
Total cash and cash equivalents and restricted cash and cash equivalents	2,383	1,817	$ 2,058	$ 1,244
MidAmerican Funding, LLC
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	700	261
Restricted cash and cash equivalents, current	9	10
Total cash and cash equivalents and restricted cash and cash equivalents	$ 709	$ 271	$ 590	$ 240