PENSION AND OTHER POSTRETIREMENT BENEFITS - Pre-tax Amounts Recorded in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Jun. 28, 2019	Jun. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 745	$ 110
Net prior service cost (credit)	5	3
Defined benefit plan, accumulated comprehensive income (loss)	750	113
Pension
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	781	156
Net prior service cost (credit)	6	4
Defined benefit plan, accumulated comprehensive income (loss)	787	160
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(36)	(46)
Net prior service cost (credit)	(1)	(1)
Defined benefit plan, accumulated comprehensive income (loss)	$ (37)	$ (47)