Goodwill (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	$ 7,092
Tax benefit credited to goodwill	(3)
Goodwill, balance at end of period	7,089
Activision
Changes in carrying amount of goodwill
Goodwill, balance at beginning of period	6,914
Tax benefit credited to goodwill	(3)
Goodwill, balance at end of period	6,911
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