PENSION AND OTHER POSTRETIREMENT BENEFITS - Income Statement Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 29, 2017	Jan. 03, 2020	Jan. 01, 2021	Jun. 28, 2019	Jun. 29, 2018
Net periodic benefit income
Service cost		$ 43	$ 67
Interest cost		154	283
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Gain on pension plan curtailment		23	0	$ 0	$ 0
Pension
Net periodic benefit income
Service cost		42	65	36	39
Interest cost		149	273	209	195
Expected return on plan assets		(314)	(630)	(382)	(369)
Amortization of net actuarial loss		1	10	0	0
Amortization of prior service credit		(5)	(28)	0	0
Cost for special termination benefits		0	1	0	0
Effect of curtailments or settlements		(18)	0	1	0
Net periodic benefit income		(145)	(309)	(136)	(135)
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial loss (gain)		55	403	625	(106)
Prior service cost (credit)		(292)	1	3	2
Amortization of net actuarial loss		(5)	(10)	0	0
Amortization of prior service credit (cost)		5	28	(1)	0
Currency translation adjustment		0	2	0	0
Recognized net loss due to divestiture		(13)	0	0	0
Total change recognized in other comprehensive loss		(250)	424	627	(104)
Total impact from net periodic benefit cost and changes in other comprehensive loss		(395)	$ 115	491	(239)
Pension | U.S. | L3
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Cash balance benefit percentage			1.00%
Gain on pension plan curtailment		23
Loss on pension plan settlement		5
Other Benefits
Net periodic benefit income
Service cost		1	$ 2	0	1
Interest cost		5	10	8	7
Expected return on plan assets		(10)	(21)	(16)	(16)
Amortization of net actuarial loss		(3)	(3)	(6)	(1)
Net periodic benefit income		(7)	(12)	(14)	(9)
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial loss (gain)		(1)	4	4	(20)
Amortization of prior service credit (cost)		0	8	0	0
Amortization of net actuarial gain	$ 3	3		6	1
Total change recognized in other comprehensive loss		2	15	10	(19)
Total impact from net periodic benefit cost and changes in other comprehensive loss		$ (5)	$ 3	$ (4)	$ (28)