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Employee Benefit Plans (MEC) (Tables)
 6 Months Ended
Jun. 30, 2015
MidAmerican Energy Company [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions):
 
Three-Month Periods
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
2015
 
2014
 
2015
 
2014
Pension:
 
 
 
 
 
 
 
Service cost
$
3

 
$
4

 
$
6

 
$
7

Interest cost
8

 
9

 
16

 
18

Expected return on plan assets
(12
)
 
(12
)
 
(23
)
 
(23
)
Net amortization
1

 
—

 
1

 
1

Net periodic benefit cost
$
—

 
$
1

 
$
—

 
$
3

 
 
 
 
 
 
 
 
Other postretirement:
 
 
 
 
 
 
 
Service cost
$
1

 
$
2

 
$
3

 
$
3

Interest cost
3

 
3

 
5

 
5

Expected return on plan assets
(3
)
 
(4
)
 
(7
)
 
(7
)
Net amortization
(1
)
 
(1
)
 
(2
)
 
(2
)
Net periodic benefit cost (benefit)
$
—

 
$
—

 
$
(1
)
 
$
(1
)