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Accumulated Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
 
The components of accumulated other comprehensive income (loss) were as follows (amounts in millions):

 
For the Six Months Ended June 30, 2019
 
Foreign currency translation adjustments
 
Unrealized gain (loss) on forward contracts
 
Unrealized gain (loss) on available-for-sale securities
 
Total
Balance at December 31, 2018
$
(629
)
 
$
23

 
$
5

 
$
(601
)
Other comprehensive income (loss) before reclassifications
1

 
11

 
(1
)
 
11

Amounts reclassified from accumulated other comprehensive income (loss) into earnings
—

 
(17
)
 
(1
)
 
(18
)
Balance at June 30, 2019
$
(628
)
 
$
17

 
$
3

 
$
(608
)
 
 
For the Six Months Ended June 30, 2018
 
Foreign currency translation adjustments
 
Unrealized gain (loss) on forward contracts
 
Unrealized gain (loss) on available-for-sale securities
 
Total
Balance at December 31, 2017
$
(623
)
 
$
(15
)
 
$
—

 
$
(638
)
Cumulative impact from adoption of new revenue accounting standard
3

 
—

 
—

 
3

Other comprehensive income (loss) before reclassifications
(10
)
 
22

 
4

 
16

Amounts reclassified from accumulated other comprehensive income (loss) into earnings
—

 
14

 
—

 
14

Balance at June 30, 2018
$
(630
)
 
$
21

 
$
4

 
$
(605
)