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Goodwill
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill
The changes in the carrying amount of goodwill by operating segment are as follows (amounts in millions):
 
Activision
 
Blizzard (1)
 
King
 
Total
Balance at December 31, 2015
$
6,905

 
$
190

 
$
—

 
$
7,095

Additions through acquisition
—

 
—

 
2,675

 
2,675

Other
(2
)
 
—

 
—

 
(2
)
Balance at December 31, 2016
$
6,903

 
$
190

 
$
2,675

 
$
9,768

Other
(5
)
 
—

 
—

 
(5
)
Balance at December 31, 2017
$
6,898

 
$
190

 
$
2,675

 
$
9,763



(1)
As a result of the change in our operating segments discussed in Note 1, goodwill of $12 million previously reported within the “Other segments” is now included in the “Blizzard” reportable segment. The prior period balance has been revised to reflect this change.

For 2016, the addition to goodwill through acquisition is attributed to the King Acquisition (see Note 20). At December 31, 2017, 2016, and 2015, there were no accumulated impairment losses.