Retirement Plans (Tables)

9 Months Ended

Oct. 03, 2020

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit cost (credit)

The components of net periodic benefit cost (credit) for these plans are as follows:

​	Three Months Ended				Nine Months Ended
(In millions)	October 3, 2020		September 28, 2019		October 3, 2020		September 28, 2019
Pension Benefits	​		​		​		​
Service cost	$	27	$	23	$	79	$	68
Interest cost	73		82		220		245
Expected return on plan assets	(144)		(139)		(431)		(417)
Amortization of net actuarial loss	47		26		139		76
Amortization of prior service cost	3		3		9		10
Net periodic benefit cost (credit)	$	6	$	(5)	$	16	$	(18)
Postretirement Benefits Other Than Pensions
Service cost	$	—	$	1	$	2	$	2
Interest cost	2		3		6		8
Amortization of net actuarial loss	(1)		(1)		(1)		(2)
Amortization of prior service credit	(1)		(2)		(4)		(5)
Net periodic benefit cost	$	—	$	1	$	3	$	3