Revenue (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 03, 2020	Apr. 03, 2020	Mar. 29, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue, OTLs and STLs		$ 110	$ 106
Revenue, remaining performance obligation	$ 2,400	2,400
Revenue, remaining performance obligation, expected satisfaction in next 12 months, percent	46.00%
Revenue, remaining performance obligation, expected satisfaction in subsequent 12 months, percent	24.00%
Contract with customer, asset, net	$ 120	120		$ 77
Contract with customer, liability	$ 1,200	1,200		$ 806
Contract with customer, liability, revenue recognized		$ 268	$ 267