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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Accumulated Other Comprehensive Loss
ACCUMULATED OTHER COMPREHENSIVE LOSS
Changes in the composition of accumulated other comprehensive loss for 2015, 2016, and 2017 are as follows (in millions):
 
 
Foreign currency
translation
adjustments
 
Unrealized gains on
available-for-sale
securities
 
Total
Balances as of January 1, 2015
 
$
(512
)
 
$
1

 
$
(511
)
Other comprehensive income (loss)
 
(210
)
 
(2
)
 
(212
)
Balances as of December 31, 2015
 
(722
)
 
(1
)
 
(723
)
Other comprehensive income (loss)
 
(279
)
 
17

 
(262
)
Balances as of December 31, 2016
 
(1,001
)
 
16

 
(985
)
Other comprehensive income (loss)
 
533

 
(32
)
 
501

Balances as of December 31, 2017
 
$
(468
)
 
$
(16
)
 
$
(484
)

Amounts included in accumulated other comprehensive loss are recorded net of their related income tax effects.