Commitments and Contingencies (MEC) (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 number_of_projects	Dec. 31, 2012	Dec. 31, 2011
Contractual Obligation [Line Items]
Number of Multi-Value Projects	4
Contractual Obligation, Due in Next Twelve Months	$ 1,247
Contractual Obligation, Due in Second Year	994
Contractual Obligation, Due in Third Year	254
Contractual Obligation, Due in Fourth Year	164
Contractual Obligation, Due in Fifth Year	63
Contractual Obligation, Due after Fifth Year	621
Contractual Obligation	3,343
Rent expense	34	32	25
Coal and natural gas for generation [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	180
Purchase Obligation, Due in Second Year	114
Purchase Obligation, Due in Third Year	90
Purchase Obligation, Due in Fourth Year	40
Purchase Obligation, Due in Fifth Year	3
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	427
Electric capacity and transmission [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	29
Purchase Obligation, Due in Second Year	29
Purchase Obligation, Due in Third Year	27
Purchase Obligation, Due in Fourth Year	26
Purchase Obligation, Due in Fifth Year	9
Purchase Obligation, Due after Fifth Year	90
Purchase Obligation	210
Natural gas contracts for gas operations [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	145
Purchase Obligation, Due in Second Year	64
Purchase Obligation, Due in Third Year	54
Purchase Obligation, Due in Fourth Year	44
Purchase Obligation, Due in Fifth Year	17
Purchase Obligation, Due after Fifth Year	6
Purchase Obligation	330
Construction commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	859
Purchase Obligation, Due in Second Year	754
Purchase Obligation, Due in Third Year	38
Purchase Obligation, Due in Fourth Year	18
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	1,669
Operating leases, easements and maintenance and services contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	34
Purchase Obligation, Due in Second Year	33
Purchase Obligation, Due in Third Year	45
Purchase Obligation, Due in Fourth Year	36
Purchase Obligation, Due in Fifth Year	34
Purchase Obligation, Due after Fifth Year	525
Purchase Obligation	$ 707