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Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Change in Accounting Estimate [Line Items]
Revenue recognized from performance obligations satisfied in prior periods	$ 102	$ 121	$ 317	$ 359
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Net EAC adjustments, before income taxes	85	99	247	300
Net EAC adjustments, net of income taxes	$ 64	$ 74	$ 186	$ 225
Net EAC adjustments, net of income taxes, per diluted common share (in dollars per share)	$ 0.32	$ 0.34	$ 0.91	$ 1.03

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Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

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