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Components of Accumulated Other Comprehensive Income (Loss), Net (MEC) (Tables)
 6 Months Ended
Jun. 30, 2015
MidAmerican Energy Company [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Components of Accumulated Other Comprehensive Income (Loss), Net [Table Text Block]
The following table shows the change in accumulated other comprehensive income (loss), net ("AOCI") by each component of other comprehensive income, net of applicable income taxes (in millions):
 
 
Unrealized
 
Unrealized
 
Accumulated
 
 
Losses on
 
(Losses) Gains
 
Other
 
 
Available-For-Sale
 
on Cash Flow
 
Comprehensive
 
 
Securities
 
Hedges
 
(Loss) Income, Net
 
 
 
 
 
 
 
Balance, December 31, 2013
 
$
(4
)
 
$
(7
)
 
$
(11
)
Other comprehensive income
 
1

 
23

 
24

Balance, June 30, 2014
 
$
(3
)
 
$
16

 
$
13

 
 
 
 
 
 
 
Balance, December 31, 2014
 
$
(3
)
 
$
(20
)
 
$
(23
)
Other comprehensive income (loss)
 
1

 
(4
)
 
(3
)
Balance, June 30, 2015
 
$
(2
)
 
$
(24
)
 
$
(26
)