Employee Benefits - Components of Plan Benefit Expense (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Oct. 02, 2021	Sep. 26, 2020
Defined Benefit Plan Disclosure [Line Items]
Curtailment (gain) loss			$ (7)
Pension | Global Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 9		$ 27	$ 27
Interest cost	25	31		75	99
Expected return on plan assets	(76)	(87)		(231)	(257)
Amortization of unrecognized prior service cost (gain)	2	1		6	5
Recognized net (gain) loss	83	7		63	64
Net periodic benefit cost	43	(39)		(60)	(62)
Curtailment (gain) loss	(1)	0		(1)	(7)
Total plan benefit (income) expense	42	(39)		(61)	(69)
Other Nonpension Postretirement | U.S. and Canada
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2		9	9
Interest cost	5	7		15	23
Expected return on plan assets	(23)	(24)		(69)	(70)
Amortization of unrecognized prior service cost (gain)	(2)	(1)		(6)	(6)
Total plan benefit (income) expense	(17)	(16)		(51)	(44)
Postemployment | Global Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1		3	3
Interest cost	1	1		1	1
Recognized net (gain) loss	0	0		(2)	(2)
Total plan benefit (income) expense	$ 2	$ 2		$ 2	$ 2