Restructuring Activities Restructuring Costs Excluded from Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting Information [Line Items]
Restructuring and related cost, incurred cost (credit)	$ 15	$ 31	$ 56	$ 278
United States
Segment Reporting Information [Line Items]
Restructuring and related cost, incurred cost (credit)	8	23	34	144
Canada
Segment Reporting Information [Line Items]
Restructuring and related cost, incurred cost (credit)	4	4	10	70
EMEA
Segment Reporting Information [Line Items]
Restructuring and related cost, incurred cost (credit)	0	(11)	4	17
Rest of World
Segment Reporting Information [Line Items]
Restructuring and related cost, incurred cost (credit)	2	5	3	14
General corporate expenses
Segment Reporting Information [Line Items]
Restructuring and related cost, incurred cost (credit)	$ 1	$ 10	$ 5	$ 33