Property, Plant and Equipment, Net Property, Plant and Equipment - LLC (Details) - Other Capitalized Property Plant and Equipment [Member] - MidAmerican Funding, LLC and Subsidiaries [Domain] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 24
Accumulated depreciation and amortization	$ 10	$ 9
Construction in Progress, Gross		$ 1