Postemployment Benefits Pension Plans - Net Cost/(Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service costs/(credits)			$ (229)	$ (261)
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2	6	7
Interest cost	41	41	122	118
Expected return on plan assets	(58)	(60)	(172)	(187)
Amortization of prior service costs/(credits)	0	0	0	0
Amortization of unrecognized losses/(gains)	0	0	0	0
Settlements	0	(1)	0	(3)
Curtailments			0	0
Special/contractual termination benefits	0	0	0	0
Other	0	0	0	0
Net cost/(benefit)	(15)	(18)	(44)	(65)
Pension Plans | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	12	14
Interest cost	12	16	38	52
Expected return on plan assets	(34)	(42)	(107)	(134)
Amortization of prior service costs/(credits)	1	0	1	0
Amortization of unrecognized losses/(gains)	0	1	0	2
Settlements	0	0	0	58
Curtailments			0	(1)
Special/contractual termination benefits	1	0	1	6
Other	2	0	3	0
Net cost/(benefit)	$ (14)	$ (21)	$ (52)	$ (3)