Segment and Geographic Data - Selected financial information by geographic area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets
Revenues	$ 3,750	$ 3,200	$ 3,726	$ 3,296	$ 4,017	$ 3,484	$ 3,604	$ 3,093	$ 13,972	$ 14,198	$ 13,788
Property, plant and equipment, net	2,615				2,721				2,615	2,721
United States
Revenues from External Customers and Long-Lived Assets
Revenues									8,667	8,786	8,574
Property, plant and equipment, net	2,115				2,172				2,115	2,172
Europe
Revenues from External Customers and Long-Lived Assets
Revenues									2,187	1,962	1,954
Property, plant and equipment, net	267				328				267	328
Asia and Australia
Revenues from External Customers and Long-Lived Assets
Revenues									1,253	1,206	998
Property, plant and equipment, net	88				84				88	84
Other international
Revenues from External Customers and Long-Lived Assets
Revenues									1,865	2,244	$ 2,262
Property, plant and equipment, net	$ 145				$ 137				$ 145	$ 137