Employee Benefit Plans (MEC) Level 3 Rollforward (Details) (MidAmerican Energy Company [Member], United States Pension Plans of US Entity, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets	$ 722		$ 643		$ 555
Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets	31	[1]	26	[1]
Real Estate Funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets	31		26
Real Estate Funds [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets	26	[1]	24		17
Actual return on plan assets still held at period end	5		2		4
Purchases and sales	0		0		3
Defined Benefit Plan, Fair Value of Plan Assets	$ 31	[1]	$ 26	[1]	$ 24

[1] (1)Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.