Special Charges - Restructuring Reserve (Details) $ in Millions	9 Months Ended
	Oct. 03, 2020 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 65
Provision for 2020 COVID-19 restructuring plan	68
Cash paid	(70)
Ending balance	63
Severance Costs
Restructuring Reserve [Roll Forward]
Beginning balance	46
Provision for 2020 COVID-19 restructuring plan	56
Cash paid	(62)
Ending balance	40
Contract Terminations and Others
Restructuring Reserve [Roll Forward]
Beginning balance	19
Provision for 2020 COVID-19 restructuring plan	12
Cash paid	(8)
Ending balance	$ 23