PENSION AND OTHER POSTRETIREMENT BENEFITS - Income Statement Information (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jan. 03, 2020	Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Net periodic benefit income
Effect of curtailments or settlements	$ (23)	$ 0	$ 0	$ 0
Pension
Net periodic benefit income
Service cost	42	36	39	58
Interest cost	149	209	195	184
Expected return on plan assets	(314)	(382)	(369)	(340)
Amortization of net actuarial loss (gain)	1	0	0	1
Amortization of prior service credit	(5)	0	0	0
Effect of curtailments or settlements	(18)	1	0	0
Net periodic benefit income	(145)	(136)	(135)	(97)
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial loss (gain)	55	625	(106)	(284)
Prior service (credit) cost	(292)	3	2	0
Amortization of net actuarial gain (loss)	(5)	0	0	(1)
Amortization of prior service credit (cost)	5	(1)	0	0
Recognized net loss due to divestiture	(13)	0	0	0
Total change recognized in other comprehensive loss	(250)	627	(104)	(285)
Total impact from net periodic benefit cost and changes in other comprehensive loss	(395)	491	(239)	(382)
Pension | U.S. | L3
Net periodic benefit income
Effect of curtailments or settlements	(23)
Other Benefits
Net periodic benefit income
Service cost	1	0	1	1
Interest cost	5	8	7	8
Expected return on plan assets	(10)	(16)	(16)	(17)
Amortization of net actuarial loss (gain)	(3)	(6)	(1)	0
Effect of curtailments or settlements	5
Net periodic benefit income	(7)	(14)	(9)	(8)
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial loss (gain)	(1)	4	(20)	(38)
Amortization of net actuarial gain (loss)	3	6	1	0
Total change recognized in other comprehensive loss	2	10	(19)	(38)
Total impact from net periodic benefit cost and changes in other comprehensive loss	$ (5)	$ (4)	$ (28)	$ (46)