Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 27, 2019	Sep. 28, 2018
Pension
Net periodic benefit income
Service cost	$ 21	$ 9
Interest cost	76	52
Expected return on plan assets	(157)	(95)
Amortization of net actuarial gain	0	0
Net periodic benefit income	(60)
Effect of curtailments or settlements	5
Total net periodic benefit income	(55)	(34)
Other Benefits
Net periodic benefit income
Service cost	1	0
Interest cost	2	2
Expected return on plan assets	(5)	(4)
Amortization of net actuarial gain	(1)	(2)
Net periodic benefit income	(3)
Effect of curtailments or settlements	0
Total net periodic benefit income	$ (3)	$ (4)