Supplemental Cash Flow Disclosures - MidAmerican Funding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,096	$ 1,290
Restricted cash and cash equivalents	127	140
Total cash and cash equivalents and restricted cash and cash equivalents	1,244	1,445	$ 1,268	$ 883
Interest paid, net of amounts capitalized	2,041	1,855	1,723
Income taxes received, net	1,309	1,361	850
Accrued capital expenditures	834	801	888
MidAmerican Funding, LLC
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	233	39
Restricted cash and cash equivalents	7	7
Total cash and cash equivalents and restricted cash and cash equivalents	240	46	331	$ 57
Interest paid, net of amounts capitalized	296	302	245
Income taxes received, net	751	715	456
Accrued capital expenditures	257	227	337
Property, Plant and Equipment | MidAmerican Funding, LLC
Condensed Cash Flow Statements, Captions [Line Items]
Distribution of corporate aircraft to parent	$ 0	$ 0	$ 8