PENSION AND OTHER POSTRETIREMENT BENEFITS - Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2017	Jul. 01, 2016	Jul. 03, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5,133	$ 4,489	$ 4,757
Projected benefit obligation	(6,405)	(6,782)	(6,938)
Funded status	(1,272)	(2,293)
Other non-current assets
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	9	5
Compensation and benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits	(3)	(2)
Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans	(1,278)	(2,296)
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,921	4,273	4,500
Projected benefit obligation	(6,140)	(6,471)	(6,493)
Funded status	(1,219)	(2,198)
Pension | Other non-current assets
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	9	5
Pension | Compensation and benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits	(2)	(2)
Pension | Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans	(1,226)	(2,201)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212	216	257
Projected benefit obligation	(265)	(311)	$ (445)
Funded status	(53)	(95)
Other Benefits | Other non-current assets
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other Benefits | Compensation and benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits	(1)	0
Other Benefits | Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans	$ (52)	$ (95)