Segment Information (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 ReportableSegments	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of Reportable Segments	3
Regulated electric	$ 450	$ 415
Regulated gas	511	315
Nonregulated energy	264	190
Total operating revenue	1,225	920
Depreciation and amortization	85	107
Total operating income	153	106
Assets	12,012		11,869
Regulated electric [Member]
Segment Reporting Information [Line Items]
Regulated electric	450	415
Depreciation and amortization	75	98
Total operating income	83	50
Assets	10,622		10,532
Regulated gas [Member]
Segment Reporting Information [Line Items]
Regulated gas	511	315
Depreciation and amortization	10	9
Total operating income	58	45
Assets	1,226		1,206
Nonregulated energy [Member]
Segment Reporting Information [Line Items]
Nonregulated energy	264	190
Total operating income	12	11
Assets	$ 164		$ 131