Basis of Presentation - Recent Acquisitions (Details) - USD ($) shares in Millions, $ in Millions	Aug. 28, 2020	Jul. 31, 2020	Jun. 16, 2020	Apr. 30, 2020	Mar. 03, 2020	Oct. 16, 2019	Jul. 11, 2019	Mar. 11, 2019	Jan. 07, 2019
Callyo
Business Acquisition [Line Items]
Consideration transferred	$ 63
Share-based compensation acquired	$ 3
Share-based compensation withheld, average service period	2 years
Cash paid for acquisition, net of cash acquired	$ 61
Pelco, Inc.
Business Acquisition [Line Items]
Consideration transferred		$ 110
Cash paid for acquisition, net of cash acquired		$ 108
IndigoVision
Business Acquisition [Line Items]
Consideration transferred			$ 37
Cash paid for acquisition, net of cash acquired			$ 35
Cybersecurity Services Business
Business Acquisition [Line Items]
Consideration transferred					$ 40
Share-based compensation acquired					$ 6
Share-based compensation withheld, average service period					2 years
Cash paid for acquisition, net of cash acquired				$ 32	$ 33
Data Solutions Business
Business Acquisition [Line Items]
Consideration transferred						$ 85
WatchGuard
Business Acquisition [Line Items]
Consideration transferred							$ 271
Share-based compensation acquired							$ 16
Share-based compensation withheld, average service period							2 years
Cash paid for acquisition, net of cash acquired							$ 250
Avtec
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired								$ 136
VaaS
Business Acquisition [Line Items]
Consideration transferred									$ 445
Share-based compensation acquired									$ 38
Share-based compensation withheld, average service period									1 year
Cash paid for acquisition, net of cash acquired									$ 231
Shares issued (in shares)									1.4
Share value									$ 160
Total consideration									$ 391