Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Change in Accounting Estimate [Line Items]
Revenue recognized from performance obligations satisfied in prior periods	$ 102	$ 25	$ 238	$ 43
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Net EAC adjustments, before income taxes	98	12	201	18
Net EAC adjustments, net of income taxes	$ 73	$ 9	$ 151	$ 13
Net EAC adjustments, net of income taxes, per diluted share (in dollars per share)	$ 0.34	$ 0.07	$ 0.69	$ 0.10