Intangible Assets and Goodwill - Recent Acquisition (Details) - USD ($) shares in Millions, $ in Millions	Jun. 16, 2020	Apr. 30, 2020	Mar. 03, 2020	Oct. 16, 2019	Jul. 11, 2019	Mar. 11, 2019	Jan. 07, 2019	Jun. 27, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill								$ 2,123	$ 2,067
IndigoVision
Business Acquisition [Line Items]
Consideration transferred	$ 37
Payments for acquisition	35
Goodwill	14
Intangible assets acquired	22
Net liabilities	1
Cybersecurity Services Business
Business Acquisition [Line Items]
Consideration transferred			$ 40
Goodwill		$ 23	28
Intangible assets acquired		10	7
Net liabilities		1	2
Cash paid for acquisition		32	33
Share-based compensation acquired			$ 6
Share-based compensation withheld, average service period			2 years
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
Goodwill					156
Intangible assets acquired					63
Cash paid for acquisition					250
Share-based compensation acquired					$ 16
Share-based compensation withheld, average service period					2 years
Debt assumed					$ 16
Acquired assets					31
Avtec
Business Acquisition [Line Items]
Goodwill						$ 68
Intangible assets acquired						$ 64
Useful life						15 years
Cash paid for acquisition						$ 136
Acquired assets						4
VaaS
Business Acquisition [Line Items]
Consideration transferred							$ 445
Goodwill							261
Intangible assets acquired							141
Cash paid for acquisition							231
Share-based compensation acquired							$ 38
Share-based compensation withheld, average service period							1 year
Debt assumed							$ 38
Shares acquired (in shares)							1.4
Share value							$ 160
Total consideration							391
Acquired liabilities							11
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 | 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