Income Taxes (MEC) Net Unrecognized Tax Benefits (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Net Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$ 29	$ 36
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]
Beginning balance	36	46
Additions based on tax positions related to current year	10	10
Additions for tax positions of prior years	3	25
Reductions based on tax positions related to the current year	(10)	(16)
Reductions for tax positions of prior years	(8)	(23)
Statute of limitations	(2)	(3)
Settlements	0	(2)
Interest and penalties	0	(1)
Ending balance	$ 29	$ 36