Backlog (Details) - USD ($) $ in Millions	Oct. 02, 2020	Jan. 03, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Backlog		$ 20,600
Airport Security and Automation Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Backlog		$ 380
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-03
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Backlog	$ 20,800
Revenue performance obligation percentage	65.00%
Revenue performance obligation expected timing of satisfaction period	1 year 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue performance obligation percentage	15.00%
Revenue performance obligation expected timing of satisfaction period	1 year