Postemployment Benefits Pension Plans - Net Cost/(Benefit) (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2
Interest cost	33	41
Expected return on plan assets	(52)	(57)
Net cost/(benefit)	(17)	(14)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4
Interest cost	9	13
Expected return on plan assets	(26)	(37)
Net cost/(benefit)	$ (13)	$ (20)