Employee Benefits - Components of Plan Benefit Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Pension | Global Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 9
Interest cost	35	45
Expected return on plan assets	(85)	(85)
Amortization of unrecognized prior service cost (gain)	2	2
Recognized net (gain) loss	14	1
Total plan benefit (income) expense	(25)	(28)
Other Nonpension Postretirement | U.S. and Canada
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	8	10
Expected return on plan assets	(23)	(21)
Amortization of unrecognized prior service cost (gain)	(2)	(2)
Total plan benefit (income) expense	(14)	(10)
Postemployment | Global Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	0	0
Recognized net (gain) loss	(1)	(1)
Total plan benefit (income) expense	$ 0	$ 0