PENSION AND OTHER POSTRETIREMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	Jan. 03, 2020	Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 8,892	$ 5,159	$ 5,305
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,618	4,958	5,098	$ 4,921
Projected benefit obligation	(10,268)	(6,123)	(5,774)	(6,140)
Funded status	(1,650)	(1,165)	(676)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	274	201	207	212
Projected benefit obligation	(369)	(221)	(233)	$ (265)
Funded status	(95)	(20)	(26)
Other non-current assets | Pension
Consolidated Balance Sheet line item amounts:
Defined benefit plans, current assets	91	12	15
Other non-current assets | Other Benefits
Consolidated Balance Sheet line item amounts:
Defined benefit plans, current assets	1	0	0
Compensation and benefits | Pension
Consolidated Balance Sheet line item amounts:
Defined benefit plan liabilities, current	(10)	(7)	(2)
Compensation and benefits | Other Benefits
Consolidated Balance Sheet line item amounts:
Defined benefit plan liabilities, current	(8)	0	(1)
Liabilities of disposal group held for sale | Pension
Consolidated Balance Sheet line item amounts:
Defined benefit plan liabilities, current	0	(16)	0
Liabilities of disposal group held for sale | Other Benefits
Consolidated Balance Sheet line item amounts:
Defined benefit plan liabilities, current	0	0	0
Defined benefit plans | Pension
Consolidated Balance Sheet line item amounts:
Defined benefit plans liabilities, noncurrent	(1,731)	(1,154)	(689)
Defined benefit plans | Other Benefits
Consolidated Balance Sheet line item amounts:
Defined benefit plans liabilities, noncurrent	$ (88)	$ (20)	$ (25)