Employee Benefit Plans - MidAmerican Funding - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension | MidAmerican Funding, LLC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ 21	$ 7	$ 4
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	6	(10)	(11)
Other Postretirement | MidAmerican Funding, LLC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ 2	$ (3)	$ (2)