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Subsidiary Debt Subsidiary Debt - MEC - Maturity Schedule (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 1,006
Long-term Debt, Maturities, Repayments of Principal in Year Two 3,544
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,099
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,552
Long-term Debt, Maturities, Repayments of Principal in Year Five 823
Long-term Debt, Maturities, Repayments of Principal after Year Five 27,271
MidAmerican Energy Company [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 251
Long-term Debt, Maturities, Repayments of Principal in Year Two 351
Long-term Debt, Maturities, Repayments of Principal in Year Three 500
Long-term Debt, Maturities, Repayments of Principal in Year Four 2
Long-term Debt, Maturities, Repayments of Principal in Year Five 1
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 3,227