Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 11,409	$ 11,056
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,044	667
Public Utilities, Property, Plant and Equipment, Net	12,453	11,723
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	16,760	16,275
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,357)	(5,229)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	11,403	11,046
Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1)	(5)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6	10
Gross public utility property, plant and equipment in service	7	15
Electric Operations [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	10,601	10,404
Public Utilities, Property, Plant and Equipment, Transmission	1,479	1,305
Public Utilities, Property, Plant and Equipment, Distribution	3,138	3,059
Natural Gas Processing Plant [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,542	$ 1,507