Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	$ 9,768,000,000	$ 7,095,000,000
Additions through acquisition		2,675,000,000
Other	(5,000,000)	(2,000,000)
Goodwill, balance at end of period	9,763,000,000	9,768,000,000
Accumulated impairment losses	0	0	$ 0
Activision
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	6,903,000,000	6,905,000,000
Additions through acquisition		0
Other	(5,000,000)	(2,000,000)
Goodwill, balance at end of period	6,898,000,000	6,903,000,000
Blizzard
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	190,000,000	190,000,000
Additions through acquisition		0
Other	0	0
Goodwill, balance at end of period	190,000,000	190,000,000
Goodwill segment transfer	12,000,000
King
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	2,675,000,000	0
Additions through acquisition		2,675,000,000
Other	0	0
Goodwill, balance at end of period	2,675,000,000	$ 2,675,000,000
Other segments
Changes in carrying amount of goodwill
Goodwill segment transfer	$ (12,000,000)