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LEGAL PROCEEDINGS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 24, 2017
Dec. 31, 2016
Apr. 24, 2009
Loss Contingencies [Line Items]        
Damages sought by plaintiff   $ 52    
Liabilities recorded relative to environmental matters   952 $ 1,000  
Environmental costs eligible for future recovery   $ 825 870  
Period over which costs and recovery of costs is projected   20 years    
Outstanding letters of credit, surety bonds, and third-party guarantees   $ 3,300 3,700  
Third-party guarantees   $ 726 $ 709  
Guarantees of contractual performance of joint ventures (as a percent)   60.00% 56.00%  
United Launch Alliance        
Loss Contingencies [Line Items]        
Ownership interest of ULA (as a percent)   50.00%    
N.Y. Metropolitan Transportation Authority        
Loss Contingencies [Line Items]        
Damages sought by plaintiff   $ 190    
Contract value       $ 323
Contract payments received to date   241    
Claims for monetary damages against the plaintiff   95    
Period of bench trial 35 days      
United Launch Alliance        
Loss Contingencies [Line Items]        
Inventory supply agreement   $ 120