Segment Information (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 ReportableSegments	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of Reportable Segments			3
Regulated electric	$ 426	$ 411	$ 876	$ 826
Regulated gas	136	142	647	457
Nonregulated energy	207	204	471	394
Total operating revenue	769	757	1,994	1,677
Depreciation and amortization	85	104	170	211
Total operating income	51	43	204	149
Assets	12,687		12,687		11,869
Regulated electric [Member]
Segment Reporting Information [Line Items]
Regulated electric	426	411	876	826
Depreciation and amortization	76	95	151	193
Total operating income	48	31	131	81
Assets	11,392		11,392		10,532
Regulated gas [Member]
Segment Reporting Information [Line Items]
Regulated gas	136	142	647	457
Depreciation and amortization	9	9	19	18
Total operating income	(3)	4	55	49
Assets	1,133		1,133		1,206
Nonregulated energy [Member]
Segment Reporting Information [Line Items]
Nonregulated energy	207	204	471	394
Total operating income	6	8	18	19
Assets	$ 162		$ 162		$ 131