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Employee Benefit Plans - MidAmerican Funding - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Plan [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 4 $ 3 $ 4
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (11) (21) (16)
Other Postretirement Benefits Plan [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (2) $ (2) $ (3)