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Subsidiary Debt Subsidiary Debt - MEC - Maturity Schedule (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 2,106
Long-term Debt, Maturities, Repayments of Principal in Year Two 2,207
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,342
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,788
Long-term Debt, Maturities, Repayments of Principal in Year Five 2,513
Long-term Debt, Maturities, Repayments of Principal after Year Five 27,058
MidAmerican Energy Company [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 500
Long-term Debt, Maturities, Repayments of Principal in Year Two 2
Long-term Debt, Maturities, Repayments of Principal in Year Three 0
Long-term Debt, Maturities, Repayments of Principal in Year Four 0
Long-term Debt, Maturities, Repayments of Principal in Year Five 315
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 4,611