Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Apr. 03, 2020	Mar. 29, 2019
Change in Accounting Estimate [Line Items]
Revenue recognized from performance obligations satisfied in prior periods	$ 136	$ 18
Contracts accounted for under percentage of completion
Change in Accounting Estimate [Line Items]
Operating income	103	6
Operating income, net of tax	$ 78	$ 4
Operating income, per diluted share (in dollars per share)	$ 0.35	$ 0.03

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12A
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL108322424-203045

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Balance Type:	credit
Period Type:	duration