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Components of Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2015
MidAmerican Energy Company [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table shows the change in accumulated other comprehensive loss by each component of other comprehensive income, net of applicable income taxes, for the years ended December 31, 2015 and 2014 (in millions):
 
 
Unrealized
 
Unrealized
 
Accumulated
 
 
Losses on
 
Losses
 
Other
 
 
Available-For-Sale
 
on Cash Flow
 
Comprehensive
 
 
Securities
 
Hedges
 
Loss, Net
 
 
 
 
 
 
 
Balance, December 31, 2013
 
$
(4
)
 
$
(7
)
 
$
(11
)
Other comprehensive income (loss)
 
1

 
(13
)
 
(12
)
Balance, December 31, 2014
 
$
(3
)
 
$
(20
)
 
$
(23
)
Other comprehensive income (loss)
 
—

 
(7
)
 
(7
)
Balance, December 31, 2015
 
$
(3
)
 
$
(27
)
 
$
(30
)