Employee Benefit Plans (MEC) Net Periodic Benefit Cost (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 18	$ 18	$ 18
Interest cost	33	37	39
Expected return on plan assets	(45)	(45)	(43)
Net amortization	11	4	0
Net periodic benefit cost (benefit)	17	14	14
United States Pension Plans of US Entity, Defined Benefit [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (benefit)	11	8	9
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	4	4
Interest cost	8	8	10
Expected return on plan assets	(13)	(13)	(13)
Net amortization	(3)	(3)	(2)
Net periodic benefit cost (benefit)	(3)	(4)	(1)
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (benefit)	$ (1)	$ (2)	$ 0