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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Changes in Composition of Accumulated Other Comprehensive Income or Loss
Changes in the composition of accumulated other comprehensive loss for 2014, 2013, and 2012 are as follows (in millions):
 
 
 
Foreign currency
translation
adjustments
 
Unrealized gains on
available-for-sale
securities
 
Total
Balances as of January 1, 2012
 
$
(326
)
 
$
10

 
$
(316
)
Other comprehensive income
 
76

 
1

 
77

Balances as of December 31, 2012
 
(250
)
 
11

 
(239
)
Other comprehensive income (loss)
 
63

 
(9
)
 
54

Balances as of December 31, 2013
 
(187
)
 
2

 
(185
)
Other comprehensive income (loss)
 
(325
)
 
(1
)
 
(326
)
Balances as of December 31, 2014
 
$
(512
)
 
$
1

 
$
(511
)