Other Current Liabilities - Restructuring reserve activity (Details) $ in Millions	3 Months Ended
	Apr. 04, 2020 USD ($)
Restructuring reserve activity
Balance at beginning of period	$ 65
Cash paid	(28)
Balance at end of period	37
Remaining expected cash payments for restructuring activities	37
Severance Costs
Restructuring reserve activity
Balance at beginning of period	46
Cash paid	(26)
Balance at end of period	20
Contract Terminations and Other
Restructuring reserve activity
Balance at beginning of period	19
Cash paid	(2)
Balance at end of period	$ 17