Goodwill (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	$ 7,092
Tax benefit credited to goodwill	(4)
Goodwill, balance at end of period	7,088
Activision
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	6,914
Tax benefit credited to goodwill	(4)
Goodwill, balance at end of period	6,910
Blizzard
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	178
Tax benefit credited to goodwill	0
Goodwill, balance at end of period	$ 178