Employee Benefit Plans (MEC) Unrecognized Amounts (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Amortization of net loss	$ 3
Amortization of prior service cost (credit), net	(5)
Amounts that will be amortized from regulatory assets (liabilities) in 2014	(2)
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gain) loss	(44)	121
Prior service costs (credit)	3	4
Total net periodic benefit cost (benefit) not yet recognized	(41)	125	115
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	(155)	14
Net amortization	(11)	(4)
Net periodic benefit cost (benefit) not yet recognized, arising during the year	(166)	10
Amortization of net loss	1
Amortization of prior service cost (credit), net	0
Amounts that will be amortized from regulatory assets (liabilities) in 2014	1
United States Pension Plans of US Entity, Defined Benefit [Member] | Regulatory Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	16	110	99
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	(91)	14
Net amortization	(3)	(3)
Net periodic benefit cost (benefit) not yet recognized, arising during the year	(94)	11
United States Pension Plans of US Entity, Defined Benefit [Member] | Regulatory Liability [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	(55)	0	0
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	(49)	0
Net amortization	(6)	0
Net periodic benefit cost (benefit) not yet recognized, arising during the year	(55)	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Receivables (Payables) with Affiliates [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	(2)	15	16
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	(15)	0
Net amortization	(2)	(1)
Net periodic benefit cost (benefit) not yet recognized, arising during the year	(17)	(1)
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gain) loss	41	51
Prior service costs (credit)	(47)	(53)
Total net periodic benefit cost (benefit) not yet recognized	(6)	(2)	(10)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	(7)	4
Net amortization	3	4
Net periodic benefit cost (benefit) not yet recognized, arising during the year	(4)	8
Amortization of net loss	2
Amortization of prior service cost (credit), net	(5)
Amounts that will be amortized from regulatory assets (liabilities) in 2014	(3)
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Regulatory Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	10	11	2
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	(3)	6
Net amortization	2	3
Net periodic benefit cost (benefit) not yet recognized, arising during the year	(1)	9
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Regulatory Liability [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	0	0	0
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	0	0
Net amortization	0	0
Net periodic benefit cost (benefit) not yet recognized, arising during the year	0	0
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Receivables (Payables) with Affiliates [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	(16)	(13)	(12)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	(4)	(2)
Net amortization	1	1
Net periodic benefit cost (benefit) not yet recognized, arising during the year	$ (3)	$ (1)