Operating Segments and Geographic Regions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Segment Reporting Information [Line Items]
Segment net revenues	$ 8,419	$ 6,388	$ 7,262
Net effect from recognition (deferral) of deferred net revenues	333	(101)	(238)
Total net revenues	8,086	6,489	7,500
Operating income	2,734	1,607	1,988
Share-based compensation expense	(218)	(166)	(209)
Amortization of intangible assets	(80)	(204)	(371)
Restructuring costs	(94)	(132)	(10)
Interest and other expense (income), net	87	(26)	71
Loss on extinguishment of debt	31	0	40
Income before income tax expense	2,616	1,633	1,877
Long-lived assets	453	485	282
Americas
Segment Reporting Information [Line Items]
Segment net revenues	4,719	3,297	3,729
Net effect from recognition (deferral) of deferred net revenues	285	(44)	(151)
Total net revenues	4,434	3,341	3,880
Long-lived assets	270	322	203
EMEA
Segment Reporting Information [Line Items]
Segment net revenues	2,739	2,192	2,527
Net effect from recognition (deferral) of deferred net revenues	59	(47)	(91)
Total net revenues	2,680	2,239	2,618
Long-lived assets	166	142	62
Asia Pacific
Segment Reporting Information [Line Items]
Segment net revenues	961	899	1,006
Net effect from recognition (deferral) of deferred net revenues	(11)	(10)	4
Total net revenues	972	909	1,002
Long-lived assets	$ 17	$ 21	$ 17
US | Geographic Concentration Risk | Revenues
Segment Reporting Information [Line Items]
Percentage of concentration risk	48.00%	46.00%	46.00%
UK | Geographic Concentration Risk | Revenues
Segment Reporting Information [Line Items]
Percentage of concentration risk	12.00%	12.00%	12.00%
Digital online channels
Segment Reporting Information [Line Items]
Segment net revenues	$ 7,122	$ 4,928	$ 5,718
Net effect from recognition (deferral) of deferred net revenues	464	(4)	(68)
Total net revenues	6,658	4,932	5,786
Retail channels
Segment Reporting Information [Line Items]
Segment net revenues	629	814	916
Net effect from recognition (deferral) of deferred net revenues	(112)	(95)	(191)
Total net revenues	741	909	1,107
Other
Segment Reporting Information [Line Items]
Segment net revenues	668	646	628
Net effect from recognition (deferral) of deferred net revenues	(19)	(2)	21
Total net revenues	687	648	607
Console
Segment Reporting Information [Line Items]
Segment net revenues	2,916	1,866	2,273
Net effect from recognition (deferral) of deferred net revenues	132	(54)	(265)
Total net revenues	2,784	1,920	2,538
PC
Segment Reporting Information [Line Items]
Segment net revenues	2,235	1,665	2,189
Net effect from recognition (deferral) of deferred net revenues	179	(53)	9
Total net revenues	2,056	1,718	2,180
Mobile and ancillary
Segment Reporting Information [Line Items]
Segment net revenues	2,600	2,211	2,172
Net effect from recognition (deferral) of deferred net revenues	41	8	(3)
Total net revenues	2,559	2,203	2,175
Other
Segment Reporting Information [Line Items]
Segment net revenues	668	646	628
Net effect from recognition (deferral) of deferred net revenues	(19)	(2)	21
Total net revenues	687	648	607
Reportable segments
Segment Reporting Information [Line Items]
Segment net revenues	8,011	5,969	6,835
Operating income	3,418	2,054	2,446
Reportable segments | Intersegment net revenues
Segment Reporting Information [Line Items]
Segment net revenues	111	43	53
Reportable segments | Net revenues from external customers
Segment Reporting Information [Line Items]
Segment net revenues	7,900	5,926	6,782
Reportable segments | Activision
Segment Reporting Information [Line Items]
Segment net revenues	3,942	2,219	2,458
Net effect from recognition (deferral) of deferred net revenues	253	32	(280)
Total net revenues	3,689	2,187	2,738
Operating income	1,868	850	1,011
Reportable segments | Activision | Americas
Segment Reporting Information [Line Items]
Segment net revenues	2,544	1,302	1,459
Net effect from recognition (deferral) of deferred net revenues	228	16	(163)
Total net revenues	2,316	1,286	1,622
Reportable segments | Activision | EMEA
Segment Reporting Information [Line Items]
Segment net revenues	1,097	703	770
Net effect from recognition (deferral) of deferred net revenues	36	12	(127)
Total net revenues	1,061	691	897
Reportable segments | Activision | Asia Pacific
Segment Reporting Information [Line Items]
Segment net revenues	301	214	229
Net effect from recognition (deferral) of deferred net revenues	(11)	4	10
Total net revenues	312	210	219
Reportable segments | Activision | Intersegment net revenues
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Reportable segments | Activision | Net revenues from external customers
Segment Reporting Information [Line Items]
Segment net revenues	3,942	2,219	2,458
Reportable segments | Activision | Digital online channels
Segment Reporting Information [Line Items]
Segment net revenues	3,295	1,488	1,644
Net effect from recognition (deferral) of deferred net revenues	365	122	(96)
Total net revenues	2,930	1,366	1,740
Reportable segments | Activision | Retail channels
Segment Reporting Information [Line Items]
Segment net revenues	590	728	814
Net effect from recognition (deferral) of deferred net revenues	(112)	(90)	(184)
Total net revenues	702	818	998
Reportable segments | Activision | Other
Segment Reporting Information [Line Items]
Segment net revenues	57	3	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	57	3	0
Reportable segments | Activision | Console
Segment Reporting Information [Line Items]
Segment net revenues	2,808	1,747	2,094
Net effect from recognition (deferral) of deferred net revenues	140	(36)	(257)
Total net revenues	2,668	1,783	2,351
Reportable segments | Activision | PC
Segment Reporting Information [Line Items]
Segment net revenues	646	355	345
Net effect from recognition (deferral) of deferred net revenues	64	57	(23)
Total net revenues	582	298	368
Reportable segments | Activision | Mobile and ancillary
Segment Reporting Information [Line Items]
Segment net revenues	431	114	19
Net effect from recognition (deferral) of deferred net revenues	49	11	0
Total net revenues	382	103	19
Reportable segments | Activision | Other
Segment Reporting Information [Line Items]
Segment net revenues	57	3	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	57	3	0
Reportable segments | Blizzard
Segment Reporting Information [Line Items]
Segment net revenues	1,905	1,719	2,291
Net effect from recognition (deferral) of deferred net revenues	102	(133)	25
Total net revenues	1,803	1,852	2,266
Operating income	693	464	685
Reportable segments | Blizzard | Americas
Segment Reporting Information [Line Items]
Segment net revenues	852	760	1,019
Net effect from recognition (deferral) of deferred net revenues	58	(62)	15
Total net revenues	794	822	1,004
Reportable segments | Blizzard | EMEA
Segment Reporting Information [Line Items]
Segment net revenues	593	486	708
Net effect from recognition (deferral) of deferred net revenues	43	(57)	16
Total net revenues	550	543	692
Reportable segments | Blizzard | Asia Pacific
Segment Reporting Information [Line Items]
Segment net revenues	460	473	564
Net effect from recognition (deferral) of deferred net revenues	1	(14)	(6)
Total net revenues	459	487	570
Reportable segments | Blizzard | Intersegment net revenues
Segment Reporting Information [Line Items]
Segment net revenues	111	43	53
Reportable segments | Blizzard | Net revenues from external customers
Segment Reporting Information [Line Items]
Segment net revenues	1,794	1,676	2,238
Reportable segments | Blizzard | Digital online channels
Segment Reporting Information [Line Items]
Segment net revenues	1,774	1,452	2,041
Net effect from recognition (deferral) of deferred net revenues	102	(128)	32
Total net revenues	1,672	1,580	2,009
Reportable segments | Blizzard | Retail channels
Segment Reporting Information [Line Items]
Segment net revenues	39	86	102
Net effect from recognition (deferral) of deferred net revenues	0	(5)	(7)
Total net revenues	39	91	109
Reportable segments | Blizzard | Other
Segment Reporting Information [Line Items]
Segment net revenues	92	181	148
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	92	181	148
Reportable segments | Blizzard | Console
Segment Reporting Information [Line Items]
Segment net revenues	108	119	179
Net effect from recognition (deferral) of deferred net revenues	(8)	(18)	(8)
Total net revenues	116	137	187
Reportable segments | Blizzard | PC
Segment Reporting Information [Line Items]
Segment net revenues	1,604	1,236	1,744
Net effect from recognition (deferral) of deferred net revenues	115	(110)	33
Total net revenues	1,489	1,346	1,711
Reportable segments | Blizzard | Mobile and ancillary
Segment Reporting Information [Line Items]
Segment net revenues	101	183	220
Net effect from recognition (deferral) of deferred net revenues	(5)	(5)	0
Total net revenues	106	188	220
Reportable segments | Blizzard | Other
Segment Reporting Information [Line Items]
Segment net revenues	92	181	148
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	92	181	148
Reportable segments | King
Segment Reporting Information [Line Items]
Segment net revenues	2,164	2,031	2,086
Net effect from recognition (deferral) of deferred net revenues	(3)	2	(4)
Total net revenues	2,167	2,029	2,090
Operating income	857	740	750
Reportable segments | King | Americas
Segment Reporting Information [Line Items]
Segment net revenues	1,383	1,256	1,266
Net effect from recognition (deferral) of deferred net revenues	(1)	2	(3)
Total net revenues	1,384	1,254	1,269
Reportable segments | King | EMEA
Segment Reporting Information [Line Items]
Segment net revenues	567	557	598
Net effect from recognition (deferral) of deferred net revenues	(1)	0	(1)
Total net revenues	568	557	599
Reportable segments | King | Asia Pacific
Segment Reporting Information [Line Items]
Segment net revenues	214	218	222
Net effect from recognition (deferral) of deferred net revenues	(1)	0	0
Total net revenues	215	218	222
Reportable segments | King | Intersegment net revenues
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Reportable segments | King | Net revenues from external customers
Segment Reporting Information [Line Items]
Segment net revenues	2,164	2,031	2,086
Reportable segments | King | Digital online channels
Segment Reporting Information [Line Items]
Segment net revenues	2,164	2,031	2,086
Net effect from recognition (deferral) of deferred net revenues	(3)	2	(4)
Total net revenues	2,167	2,029	2,090
Reportable segments | King | Retail channels
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Reportable segments | King | Other
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Reportable segments | King | Console
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Reportable segments | King | PC
Segment Reporting Information [Line Items]
Segment net revenues	96	117	153
Net effect from recognition (deferral) of deferred net revenues	0	0	(1)
Total net revenues	96	117	154
Reportable segments | King | Mobile and ancillary
Segment Reporting Information [Line Items]
Segment net revenues	2,068	1,914	1,933
Net effect from recognition (deferral) of deferred net revenues	(3)	2	(3)
Total net revenues	2,071	1,912	1,936
Reportable segments | King | Other
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Non-reportable segments
Segment Reporting Information [Line Items]
Segment net revenues	519	462	480
Net effect from recognition (deferral) of deferred net revenues	(19)	(2)	21
Total net revenues	538	464	459
Non-reportable segments | Americas
Segment Reporting Information [Line Items]
Segment net revenues	0	0	13
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	13
Non-reportable segments | EMEA
Segment Reporting Information [Line Items]
Segment net revenues	519	462	467
Net effect from recognition (deferral) of deferred net revenues	(19)	(2)	21
Total net revenues	538	464	446
Non-reportable segments | Asia Pacific
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Non-reportable segments | Digital online channels
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Non-reportable segments | Retail channels
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Non-reportable segments | Other
Segment Reporting Information [Line Items]
Segment net revenues	519	462	480
Net effect from recognition (deferral) of deferred net revenues	(19)	(2)	21
Total net revenues	538	464	459
Non-reportable segments | Console
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Non-reportable segments | PC
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Non-reportable segments | Mobile and ancillary
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Non-reportable segments | Other
Segment Reporting Information [Line Items]
Segment net revenues	519	462	480
Net effect from recognition (deferral) of deferred net revenues	(19)	(2)	21
Total net revenues	538	464	459
Reconciliation items
Segment Reporting Information [Line Items]
Net effect from recognition (deferral) of deferred net revenues	(333)	101	238
Net effect from recognition (deferral) of deferred net revenues and related cost of revenues	(238)	52	100
Share-based compensation expense	(218)	(166)	(209)
Amortization of intangible assets	(79)	(203)	(370)
Restructuring costs	(94)	(137)	(10)
Discrete tax-related items	0	(17)	0
Reconciliation items | Other segments
Segment Reporting Information [Line Items]
Operating income	(55)	24	31
Elimination of intersegment revenues
Segment Reporting Information [Line Items]
Segment net revenues	(111)	(43)	(53)
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	(111)	(43)	(53)
Elimination of intersegment revenues | Americas
Segment Reporting Information [Line Items]
Segment net revenues	(60)	(21)	(28)
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	(60)	(21)	(28)
Elimination of intersegment revenues | EMEA
Segment Reporting Information [Line Items]
Segment net revenues	(37)	(16)	(16)
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	(37)	(16)	(16)
Elimination of intersegment revenues | Asia Pacific
Segment Reporting Information [Line Items]
Segment net revenues	(14)	(6)	(9)
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	(14)	(6)	(9)
Elimination of intersegment revenues | Digital online channels
Segment Reporting Information [Line Items]
Segment net revenues	(111)	(43)	(53)
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	(111)	(43)	(53)
Elimination of intersegment revenues | Retail channels
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Elimination of intersegment revenues | Other
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Elimination of intersegment revenues | Console
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Elimination of intersegment revenues | PC
Segment Reporting Information [Line Items]
Segment net revenues	(111)	(43)	(53)
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	(111)	(43)	(53)
Elimination of intersegment revenues | Mobile and ancillary
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	0	0	0
Elimination of intersegment revenues | Other
Segment Reporting Information [Line Items]
Segment net revenues	0	0	0
Net effect from recognition (deferral) of deferred net revenues	0	0	0
Total net revenues	$ 0	$ 0	$ 0