Document and Entity Information - shares
9 Months Ended
Sep. 29, 2019
Oct. 21, 2019
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 29, 2019  
Document Transition Report false  
Entity File Number 1-13699  
Entity Registrant Name RAYTHEON COMPANY  
Entity Central Index Key 0001047122  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 95-1778500  
Entity Address, Address Line One 870 Winter Street  
Entity Address, City or Town Waltham  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02451  
City Area Code 781  
Local Phone Number 522-3000  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol RTN  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   278,479,000