Reorganization of Business - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020 USD ($) employee	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($) employee	Sep. 28, 2019 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 13	$ 18	$ 72	$ 37
Reversal of accruals	3	1	$ 13	11
Restructuring charges in the period for total employee severance (in number of employees) | employee			900
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	16	19	$ 85	48
Reversal of accruals			13
Restructuring reserve	$ 87		87		$ 78
Payments for restructuring			$ 63
Number of employees expected to be paid (in number of employees) | employee	1,000		1,000
Other charges
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 10	15	$ 48	27
Costs of sales
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 3	$ 3	$ 24	$ 10