Postemployment Benefits Pension Plans - Net Cost/(Benefit) (Details) - Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 11	$ 13
Interest cost	158	178	203
Expected return on plan assets	(247)	(262)	(290)
Amortization of unrecognized losses/(gains)	0	0	0
Settlements	(4)	2	23
Curtailments	0	0	0
Special/contractual termination benefits	0	19	0
Other	0	2	0
Net cost/(benefit)	(83)	(50)	(51)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	19	25
Interest cost	67	66	87
Expected return on plan assets	(175)	(180)	(182)
Amortization of unrecognized losses/(gains)	2	1	0
Settlements	158	0	2
Curtailments	(1)	0	0
Special/contractual termination benefits	7	9	3
Other	0	(15)	0
Net cost/(benefit)	$ 77	$ (100)	$ (65)