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Backlog (Details) - USD ($)
$ in Millions
Jul. 03, 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]: 2020-07-04    
Revenue from Contract with Customer [Abstract]    
Expected timing of satisfaction period 12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Backlog $ 19,800  
Revenue performance obligation percentage 66.00%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-04    
Revenue from Contract with Customer [Abstract]    
Expected timing of satisfaction period 3 years  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue performance obligation percentage 9.00%