Income Taxes (MEC) Components of Net Deferred Income Tax Liability (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 State and Local [Member]
Deferred income tax assets: [Abstract]
Regulatory liabilities	$ 351	$ 311
Employee benefits	61	83
Derivative contracts	9	32
Asset retirement obligations	172	132
Other	60	76
Total deferred income tax assets	653	634
Deferred income tax Liabilities: [Abstract]
Depreciable property	(2,599)	(2,422)
Regulatory assets	(304)	(353)
Other	(40)	(26)
Total deferred income tax liabilities	(2,943)	(2,801)
Net deferred income tax liabilities	2,290	2,167
Reflected as: [Abstract]
Current assets - other	4	0
Current liabilities - other	0	(3)
Deferred income taxes	(2,294)	(2,164)
Summary of Tax Credit Carryforwards [Abstract]
State carryforwards					20
Net operating loss carryforwards					$ 426
Domestic carryforwards expiration date			2014	2032