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Income Taxes Income Taxes - MEC - Net Unrecognized Tax Benefits (Details) - MidAmerican Energy Company [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]    
Beginning Balance $ 26 $ 29
Additions based on tax positions related to the current year 3 6
Additions for tax positions of prior years 47 38
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions (6) (4)
Reductions for tax positions of prior years (46) (40)
Statute of limitations (5) (3)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities (6) 0
Interest and penalties (3) 0
Ending Balance 10 $ 26
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 26