| **Receivables (Tables)**   | 6 Months Ended                                                                                                                                                                                                                                                                                                                      |
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| **Receivables [Abstract]** |                                                                                                                                                                                                                                                                                                                                |
| Receivables                | Receivables are summarized below:  December 30, 2016 July 1, 2016     (In millions)Accounts receivable$469 $526Unbilled costs and accrued earnings on cost-plus contracts297 346 766 872Less allowances for collection losses(4) (1) $762 $871 |

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| - References
No definition available.
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| - Definition
Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
+ 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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