Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Components of Plan Benefit Expense

Pension

	Quarter ended						Year-to-date period ended
(millions)	June 30, 2018			July 1, 2017			June 30, 2018			July 1, 2017
Service cost	$	22		$	25		$	44		$	50
Interest cost	41			42			83			83
Expected return on plan assets	(90		)	(90		)	(182		)	(180		)
Amortization of unrecognized prior service cost	2			2			4			4
Recognized net (gain) loss	(2		)	(2		)	(11		)	1
Net periodic benefit cost	(27		)	(23		)	(62		)	(42		)
Curtailment (gain) loss	—			(3		)	—			(2		)
Total pension (income) expense	$	(27	)	$	(26	)	$	(62	)	$	(44	)

Other nonpension postretirement

	Quarter ended						Year-to-date period ended
(millions)	June 30, 2018			July 1, 2017			June 30, 2018			July 1, 2017
Service cost	$	4		$	4		$	9		$	9
Interest cost	9			9			18			18
Expected return on plan assets	(23		)	(25		)	(47		)	(49		)
Amortization of unrecognized prior service (gain)	(2		)	(2		)	(4		)	(4		)
Recognized net (gain) loss	—			—			—			(29		)
Net periodic benefit cost	(12		)	(14		)	(24		)	(55		)
Curtailment loss	—			—			—			3
Total postretirement benefit (income) expense	$	(12	)	$	(14	)	$	(24	)	$	(52	)

Postemployment

	Quarter ended					Year-to-date period ended
(millions)	June 30, 2018			July 1, 2017		June 30, 2018			July 1, 2017
Service cost	$	1		$	2	$	2		$	3
Interest cost	—			1		—			2
Recognized net (gain) loss	(1		)	—		(2		)	1
Total postemployment benefit expense	$	—		$	3	$	—		$	6

Contributions to Employee Benefit Plans

(millions)	Pension		Nonpension postretirement		Total
Quarter ended:
June 30, 2018	$	251	$	4	$	255
July 1, 2017	$	2	$	2	$	4
Year-to-date period ended:
June 30, 2018	$	266	$	8	$	274
July 1, 2017	$	23	$	5	$	28
Full year:
Fiscal year 2018 (projected)	$	274	$	13	$	287
Fiscal year 2017 (actual)	$	31	$	13	$	44