|**RESTRUCTURING AND OTHER EXIT COSTS (Tables)**     | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|**Restructuring and Related Activities [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Schedule of Restructuring and Other Exit Activities | Changes to our restructuring and other exit costs liabilities during the two quarters ended January 3, 2020and fiscal2019and2018were as follows:Employee severance-related costsFacilities consolidation and other exit costs(1)Total(In millions)Balance at June 30, 2017$12$31$43Additional provisions15051Payments(9)(38)(47)Other(2)—(2)Balance at June 29, 201824345Payments(2)(27)(29)Balance at June 28, 2019—1616Additional provisions117—117Payments(62)(1)(63)Other3(8)(5)Balance at January 3, 2020$58$7$65_______________(1)Excludes our operating lease liability related to L3’s former headquarter offices.
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|                                                    | Employee severance-related costs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                    | (In millions)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Balance at June 30, 2017                            | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Additional provisions                               | 1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Payments                                            | (9                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Other                                               | (2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Balance at June 29, 2018                            | 2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Payments                                            | (2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Balance at June 28, 2019                            | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Additional provisions                               | 117                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Payments                                            | (62                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Other                                               | 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Balance at January 3, 2020                          | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

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duration X- DefinitionTabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period.
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