Revenue - Impact of Adjustments in Contract Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 9,220	$ 9,264	$ 18,609	$ 18,013
Operating Earnings	959	834	1,897	1,768
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	75	54	160	144
Operating Earnings	$ 76	$ (5)	$ 139	$ 85
Diluted earnings per share (in dollars per share)	$ 0.21	$ (0.01)	$ 0.39	$ 0.23