PENSION AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 5,159	$ 5,305	$ 5,133
Receivables (payables), net	84	(4)
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,173	1,221
International equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	896	903
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	923	811
Government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	332	335
Other
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2	2
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	59	209
Total
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,385	3,481
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,081	2,094
Level 1 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,173	1,189
Level 1 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	896	899
Level 1 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 1 | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	12	6
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,285	1,374
Level 2 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	32
Level 2 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	4
Level 2 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	906	800
Level 2 | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	332	335
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	47	203
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	19	13	2
Level 3 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 3 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 3 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	17	11
Level 3 | Government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 3 | Other
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2	2	2
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Level 3 | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	17	11	$ 0
Investments Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,690	1,828
Investments Measured at NAV | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	703	714
Investments Measured at NAV | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	362	318
Investments Measured at NAV | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	331	395
Investments Measured at NAV | Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 294	$ 401