Restructuring and Other Exit Costs (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 29, 2018	Sep. 28, 2018
Discontinued Operations, Disposed of by Means Other than Sale
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 27	$ 22
Exelis \| Engineering, selling and administrative expenses
Restructuring Cost and Reserve [Line Items]
Charges for integration and other costs	$ 5

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration