|**Inventories**                                              | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                          
|------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Inventory Disclosure [Abstract]**                          |                                                                                                                                                                                                                                                                                                                                                                                                                         
|Inventories                                                  | InventoriesInventories are summarized below:September 29, 2017June 30, 2017(In millions)Unbilled costs and accrued earnings on fixed-price contracts$483$454Finished products10096Work in process10696Raw materials and supplies207195$896$841Unbilled costs and accrued earnings on fixed-price contracts were net of progress payments of$107 millionand$90 millionatSeptember 29, 2017andJune 30, 2017, respectively.
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|                                                             | September 29, 2017                                                                                                                                                                                                                                                                                                                                                                                                      
|                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                             | (In millions)                                                                                                                                                                                                                                                                                                                                                                                                           
|Unbilled costs and accrued earnings on fixed-price contracts | $                                                                                                                                                                                                                                                                                                                                                                                                                       
|Finished products                                            | 100                                                                                                                                                                                                                                                                                                                                                                                                                     
|Work in process                                              | 106                                                                                                                                                                                                                                                                                                                                                                                                                     
|Raw materials and supplies                                   | 207                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                             | $                                                                                                                                                                                                                                                                                                                                                                                                                       

X- ReferencesNo definition available.
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duration X- DefinitionThe entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.
+ ReferencesReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998
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