Summary of Significant Accounting Policies - MidAmerican Funding LLC - Narrative (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0
MidAmerican Funding, LLC
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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