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Other, Net - MEC (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Component of Other Income (Expense), Nonoperating [Line Items]      
Other, net $ 97 $ (9) $ (420)
MidAmerican Energy Company [Member]      
Component of Other Income (Expense), Nonoperating [Line Items]      
Other, net 50 30 37
MidAmerican Energy Company [Member] | Defined Benefit Retirement Plans, Non-service Cost Components [Member]      
Component of Other Income (Expense), Nonoperating [Line Items]      
Other, net 17 21 18
MidAmerican Energy Company [Member] | Corporate Owned Life Insurance Income (Loss) [Member]      
Component of Other Income (Expense), Nonoperating [Line Items]      
Other, net 24 6 13
MidAmerican Energy Company [Member] | Interest Income and Other Net [Member]      
Component of Other Income (Expense), Nonoperating [Line Items]      
Other, net $ 9 $ 3 $ 6