Employee Benefits - Components of Plan Benefit Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Pension | Global Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 9
Interest cost	25	35
Expected return on plan assets	(78)	(85)
Amortization of unrecognized prior service cost (gain)	2	2
Recognized net (gain) loss	(9)	14
Total plan benefit (income) expense	(51)	(25)
Other Nonpension Postretirement | U.S. and Canada
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	5	8
Expected return on plan assets	(23)	(23)
Amortization of unrecognized prior service cost (gain)	(2)	(2)
Total plan benefit (income) expense	(17)	(14)
Postemployment | Global Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Recognized net (gain) loss	(1)	(1)
Total plan benefit (income) expense	$ 0	$ 0