SIGNIFICANT ACCOUNTING POLICIES - Net Estimated at Completion ("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	Jan. 01, 2021	Jun. 28, 2019	Jun. 29, 2018
Change in Accounting Estimate [Line Items]
Net EAC adjustments, before income taxes	$ 137	$ 400	$ 17	$ (19)
Net EAC adjustments, net of income taxes	$ 103	$ 300	$ 13	$ (13)
Net EAC adjustments, net of income taxes, per diluted share (in dollars per share)	$ 0.46	$ 1.39	$ 0.10	$ (0.11)