Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Components of Plan Benefit Expense

Pension

	Quarter ended
(millions)	March 31, 2018			April 1, 2017
Service cost	$	22		$	25
Interest cost	42			41
Expected return on plan assets	(92		)	(90		)
Amortization of unrecognized prior service cost	2			2
Recognized net (gain) loss	(9		)	3
Net periodic benefit cost	(35		)	(19		)
Curtailment (gain) loss	—			1
Total pension (income) expense	$	(35	)	$	(18	)

Other nonpension postretirement

	Quarter ended
(millions)	March 31, 2018			April 1, 2017
Service cost	$	5		$	5
Interest cost	9			9
Expected return on plan assets	(24		)	(24		)
Amortization of unrecognized prior service (gain)	(2		)	(2		)
Recognized net (gain) loss	—			(29		)
Net periodic benefit cost	(12		)	(41		)
Curtailment loss	—			3
Total postretirement benefit (income) expense	$	(12	)	$	(38	)

Postemployment

	Quarter ended
(millions)	March 31, 2018			April 1, 2017
Service cost	$	1		$	1
Interest cost	—			1
Recognized net (gain) loss	(1		)	1
Total postemployment benefit expense	$	—		$	3

Contributions to Employee Benefit Plans

(millions)	Pension		Nonpension postretirement		Total
Quarter ended:
March 31, 2018	$	15	$	4	$	19
April 1, 2017	$	21	$	3	$	24
Full year:
Fiscal year 2018 (projected)	$	24	$	13	$	37
Fiscal year 2017 (actual)	$	31	$	13	$	44