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Accumulated Other Comprehensive Loss
 3 Months Ended
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
A summary of changes in accumulated other comprehensive loss is as follows (in millions):
 
 
Three Months Ended March 31,
 
 
2016
 
2015
Defined benefit plans, net
 
 
 
 
Beginning balance
 
$
(13
)
 
$
(11
)
Unrealized gain on subsidiary pension, net of tax
 
(1
)
 
1

Ending balance
 
(14
)
 
(10
)
Foreign currency translation adjustment
 
 
 
 
Beginning balance
 
(1,091
)
 
(422
)
Translation income (loss)
 
153

 
(347
)
Ending balance
 
(938
)
 
(769
)
Total accumulated other comprehensive loss
 
$
(952
)
 
$
(779
)