Income Taxes (LLC) Net Unrecognized Tax Benefits (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$ 29	$ 37
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]
Beginning balance	37	47
Additions based on tax positions related to current year	11	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	(9)	(22)
Statute of limitations	(2)	(4)
Settlements	(1)	(2)
Interest and penalties	0	(1)
Ending balance	$ 29	$ 37