SIGNIFICANT ACCOUNTING POLICIES - Net Estimated at Completion ("EAC") Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jan. 03, 2020	Dec. 31, 2021	Jan. 01, 2021	Jun. 28, 2019
Change in Accounting Estimate [Line Items]
Net EAC adjustments, before income taxes	$ 1,600	$ 3,342	$ 2,686	$ 1,446
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Net EAC adjustments, before income taxes	137	304	400	17
Net EAC adjustments, net of income taxes	$ 103	$ 228	$ 300	$ 13
Net EAC adjustments, net of income taxes, per diluted share (in dollars per share)	$ 0.46	$ 1.12	$ 1.39	$ 0.10