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Accounts Receivable and Finance Receivables - Accounts receivable (Details) - USD ($) $ in Millions	Sep. 29, 2018	Jul. 02, 2018	Dec. 31, 2017	Dec. 30, 2017
Accounts Receivable
Total	$ 1,026
Manufacturing group
Accounts Receivable
Accounts Receivable, Gross	1,051			$ 1,390
Allowance for doubtful accounts	(25)			(27)
Total	1,026			1,363
Manufacturing group \| Commercial
Accounts Receivable
Accounts Receivable, Gross	895			1,007
Manufacturing group \| U. S. Government Contracts, including foreign military sales
Accounts Receivable
Accounts Receivable, Gross	156			$ 383
Effect of adoption of ASC 606 \| ASC 606
Accounts Receivable
Total	$ 187		$ (203)
Tools and Test Equipment \| Disposition of businesses
Accounts Receivable
Accounts receivable, net		$ 71