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Subsidiary Debt Subsidiary Debt - MEC - Maturity Schedule (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 2,539
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,308
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,792
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,508
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,615
Long-term Debt, Maturities, Repayments of Principal after Year Five 29,872
MidAmerican Energy Company [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0
Long-term Debt, Maturities, Repayments of Principal in Year Two 0
Long-term Debt, Maturities, Repayments of Principal in Year Three 1
Long-term Debt, Maturities, Repayments of Principal in Year Four 315
Long-term Debt, Maturities, Repayments of Principal in Year Five 535
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 6,425