Reorganization of Business - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019 USD ($) employee	Sep. 29, 2018 USD ($)	Sep. 28, 2019 USD ($) employee	Sep. 29, 2018 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 18	$ 25	$ 37	$ 62
Reversal of accruals	1
Other charges
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	15	21	27	46
Costs of sales
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	3	4	10	16
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	19	13	48	61
Reversal of accruals			11	15
Restructuring reserve	$ 77		$ 77		$ 84
Restructuring charges in the period for total employee severance (in number of employees) | employee			600
Payments for restructuring			$ 44
Number of employees expected to be paid (in number of employees) | employee	900		900
Exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 12		$ 16