Intangible Assets and Goodwill - Recent Acquisition (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	Sep. 26, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill										$ 2,207	$ 2,067
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	$ 61
Goodwill	38
Intangible assets acquired	31
Net assets acquired	8
Pelco, Inc.
Business Acquisition [Line Items]
Consideration transferred		$ 110
Cash paid for acquisition		108
Goodwill		42
Intangible assets acquired		30
Net assets acquired		36
IndigoVision
Business Acquisition [Line Items]
Consideration transferred			$ 37
Cash paid for acquisition			35
Goodwill			14
Intangible assets acquired			22
Net liabilities			1
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				$ 32	$ 33
Goodwill				23	28
Intangible assets acquired				10	7
Net liabilities				1	$ 2
Data Solutions Business
Business Acquisition [Line Items]
Consideration transferred						$ 85
Goodwill						54
Intangible assets acquired						28
Net assets acquired						3
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							$ 250
Goodwill							156
Intangible assets acquired							63
Debt assumed							16
Acquired assets							31
Avtec
Business Acquisition [Line Items]
Cash paid for acquisition								$ 136
Goodwill								68
Intangible assets acquired								$ 64
Useful life								15 years
Acquired assets								$ 4
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									$ 231
Goodwill									261
Intangible assets acquired									141
Debt assumed									$ 38
Shares acquired (in shares)									1.4
Share value									$ 160
Total consideration									391
Acquired liabilities									11
Customer Relationships | Callyo
Business Acquisition [Line Items]
Intangible assets acquired	$ 27
Useful life	14 years
Customer Relationships | Pelco, Inc.
Business Acquisition [Line Items]
Intangible assets acquired		$ 23
Useful life		15 years
Customer Relationships | IndigoVision
Business Acquisition [Line Items]
Intangible assets acquired			$ 22
Useful life			11 years
Customer Relationships | Cybersecurity Services Business
Business Acquisition [Line Items]
Intangible assets acquired				$ 8
Useful life				12 years	13 years
Customer Relationships | Data Solutions Business
Business Acquisition [Line Items]
Intangible assets acquired						$ 22
Useful life						16 years
Customer Relationships | WatchGuard
Business Acquisition [Line Items]
Intangible assets acquired							$ 33
Useful life							13 years
Customer Relationships | Avtec
Business Acquisition [Line Items]
Intangible assets acquired								21
Customer Relationships | VaaS
Business Acquisition [Line Items]
Intangible assets acquired									$ 42
Useful life									15 years
Technology | Callyo
Business Acquisition [Line Items]
Intangible assets acquired	$ 4
Useful life	7 years
Technology | Pelco, Inc.
Business Acquisition [Line Items]
Intangible assets acquired		$ 4
Useful life		2 years
Technology | Cybersecurity Services Business
Business Acquisition [Line Items]
Intangible assets acquired				$ 2
Useful life				3 years
Technology | Data Solutions Business
Business Acquisition [Line Items]
Intangible assets acquired						$ 6
Useful life						5 years
Technology | WatchGuard
Business Acquisition [Line Items]
Intangible assets acquired							$ 30
Useful life							7 years
Technology | Avtec
Business Acquisition [Line Items]
Intangible assets acquired								$ 43
Technology | VaaS
Business Acquisition [Line Items]
Intangible assets acquired									$ 99
Useful life									10 years
Trade Names | Pelco, Inc.
Business Acquisition [Line Items]
Intangible assets acquired		$ 3
Useful life		5 years