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Accumulated Other Comprehensive (Loss) Income
 6 Months Ended
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive (Loss) Income
A summary of changes in accumulated other comprehensive (loss) income is as follows (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Defined benefit plans, net:
 
 
 
 
 
 
 
 
Balance at beginning of period
 
$
(10
)
 
$
3

 
$
(11
)
 
$
3

Unrealized gain on subsidiary pension
 
—

 
—

 
1

 
—

Balance at end of period
 
(10
)
 
3

 
(10
)
 
3

Foreign currency translation adjustment:
 
 
 
 
 
 
 
 
Balance at beginning of period
 
(769
)
 
13

 
(422
)
 
8

Translation gain (loss)
 
105

 
49

 
(242
)
 
54

Balance at end of period
 
(664
)
 
62

 
(664
)
 
62

Total accumulated other comprehensive (loss) income
 
$
(674
)
 
$
65

 
$
(674
)
 
$
65