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Subsidiary Debt Subsidiary Debt - MEC - Maturity Schedule (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 1,148
Long-term Debt, Maturities, Repayments of Principal in Year Two 985
Long-term Debt, Maturities, Repayments of Principal in Year Three 3,520
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,070
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,589
Long-term Debt, Maturities, Repayments of Principal after Year Five 28,821
MidAmerican Energy Company [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 34
Long-term Debt, Maturities, Repayments of Principal in Year Two 254
Long-term Debt, Maturities, Repayments of Principal in Year Three 351
Long-term Debt, Maturities, Repayments of Principal in Year Four 500
Long-term Debt, Maturities, Repayments of Principal in Year Five 1
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 3,162