| **Inventories**                     | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Inventory Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Inventories                         | InventoriesInventories are summarized below:  December 30, 2016 July 1, 2016     (In millions)Unbilled costs and accrued earnings on fixed-price contracts$566 $511Finished products108 128Work in process129 119Raw materials and supplies198 192 $1,001 $950Unbilled costs and accrued earnings on fixed-price contracts were net of progress payments of $98 million at December 30, 2016 and $91 million at July 1, 2016. |

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| - References
No definition available.
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| - Definition
The 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.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766
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