Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Change in Accounting Estimate [Line Items]
Revenue recognized from performance obligations satisfied in prior periods	$ 121	$ 73	$ 359	$ 116
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Net EAC adjustments, before income taxes	99	62	300	80
Net EAC adjustments, net of income taxes	$ 74	$ 46	$ 225	$ 59
Net EAC adjustments, net of income taxes, per diluted common share (in dollars per share)	$ 0.34	$ 0.20	$ 1.03	$ 0.30