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Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 49,762 $ 49,866
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value 57,189 60,633
MidAmerican Funding, LLC    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 7,961 7,450
Long-term debt, fair value   $ 9,466
MidAmerican Funding, LLC | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 9,350