Fair Value Measurements (MEC) Level 3 (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Commodity Derivatives [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0		$ 22		$ 14
Changes included in earnings	3	[1]	5	[1]	23	[1]
Changes in fair value recognized in other comprehensive income	(2)		0		(3)
Changes in fair value recognized in net regulatory assets	0		(3)		12
Sales	0		0		0
Settlements	(4)		(24)		(25)
Transfers From Level 2	0		0		1
Ending balance	(3)		0		22
Net unrealized gains (losses) included earnings	(5)		0		15
Debt Securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	21		16		20
Changes included in earnings	0	[1]	0	[1]	0	[1]
Changes in fair value recognized in other comprehensive income	2		5		1
Changes in fair value recognized in net regulatory assets	0		0		0
Sales	0		0		(5)
Settlements	0		0		0
Transfers From Level 2	0		0		0
Ending balance	$ 23		$ 21		$ 16

[1] Changes included in earnings are reported as nonregulated operating revenue on the Statements of Operations. Net unrealized (losses) gains included in earnings for the years ended December 31, 2013, 2012 and 2011, related to commodity derivatives held at December 31, 2013 , 2012 and 2011, totaled $(5) million, $- million and $15 million, respectively.