Pensions and Other Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

Net periodic benefit cost for the Company’s defined benefit retirement plans and other benefit plans for the fiscal third quarters and fiscal nine months of 2018 and 2017 include the following components:

	Fiscal Third Quarters Ended									Fiscal Nine Months Ended
	Retirement Plans					Other Benefit Plans				Retirement Plans				Other Benefit Plans
(Dollars in Millions)	September 30, 2018			October 1, 2017		September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
Service cost	$	307		266		67		62		925		772		202		185
Interest cost	247			232		37		40		748		693		112		119
Expected return on plan assets	(550		)	(514	)	(1	)	(2	)	(1,664	)	(1,528	)	(5	)	(5	)
Amortization of prior service cost/(credit)	1			1		(7	)	(8	)	2		2		(23	)	(23	)
Recognized actuarial losses	213			154		31		34		641		456		92		103
Curtailments and settlements	—			2		—		—		(2	)	1		—		—
Net periodic benefit cost	$	218		141		127		126		650		396		378		379