Leases - Other Information Related to Leases (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2019	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from sale of interests in businesses				$ 161	$ 37
Right-of-use assets obtained in exchange for lease obligations:
Operating leases		$ 14	$ 10	$ 19	$ 198
Weighted average remaining lease term:
Operating leases (in years)		6 years	5 years	6 years	5 years
Weighted average discount rate:
Operating leases		3.00%	3.00%	3.00%	3.00%
Accounting Standards Update 2016-02
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 188