Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Plans

Components of net periodic benefit cost

	Three Months Ended				Six Months Ended
(In millions)		June 30, 2018		July 1, 2017		June 30, 2018		July 1, 2017
Pension Benefits
Service cost	$	27	$	25	$	53	$	50
Interest cost		76		81		153		161
Expected return on plan assets		(139)		(127)		(277)		(253)
Amortization of net actuarial loss		39		34		77		68
Amortization of prior service cost		3		4		7		8
Net periodic benefit cost	$	6	$	17	$	13	$	34
Postretirement Benefits Other Than Pensions
Service cost	$	—	$	—	$	1	$	1
Interest cost		3		3		5		6
Amortization of prior service credit		(1)		(2)		(3)		(4)
Net periodic benefit cost	$	2	$	1	$	3	$	3