Document and Entity Information	9 Months Ended
	Sep. 30, 2011	Oct. 31, 2011
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Entity Registrant Name	MIDAMERICAN ENERGY CO
Entity Central Index Key	0000928576
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		70,980,203
MidAmerican Funding, LLC and Subsidiaries [Domain]
Entity Information [Line Items]
Entity Registrant Name	MIDAMERICAN FUNDING LLC
Entity Central Index Key	0001098296
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer