Leases - Other Information Related to Leases (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2019	Mar. 29, 2020	Mar. 31, 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		$ 5	$ 188
Weighted average remaining lease term:
Operating leases (in years)		7 years	6 years
Weighted average discount rate:
Operating leases		3.00%	3.00%
Accounting Standards Update 2016-02
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 188