SIGNIFICANT ACCOUNTING POLICIES - Net EAC Adjustments (Details) - Contracts Accounted for under Percentage of Completion - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jan. 03, 2020	Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Change in Accounting Estimate [Line Items]
Net EAC adjustments, before income taxes	$ 137	$ 17	$ (19)	$ (1)
Net EAC adjustments, net of income taxes	$ 103	$ 13	$ (13)	$ (1)
Net EAC adjustments, net of income taxes, per diluted share (in dollars per share)	$ 0.46	$ 0.10	$ (0.11)	$ (0.01)