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LEGAL PROCEEDINGS AND CONTINGENCIES (Details)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Apr. 24, 2009
USD ($)
Dec. 31, 2014
Jun. 30, 2006
subsidiary
Sep. 26, 2021
USD ($)
Dec. 31, 2020
USD ($)
May 31, 2017
lawsuit
Loss Contingencies [Line Items]            
Damages sought by plaintiff       $ 52    
Liabilities recorded relative to environmental matters       771 $ 789  
Environmental costs eligible for future recovery       $ 669 685  
Period over which costs and recovery of costs is projected       20 years    
Outstanding letters of credit, surety bonds, and third-party guarantees       $ 3,400    
Third-party guarantees       $ 842 $ 871  
Guarantees of contractual performance of joint ventures (as a percent)       69.00% 71.00%  
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        
Sikorsky Aircraft Corporation            
Loss Contingencies [Line Items]            
Number of pending claims | lawsuit           2
Number of entities involved in litigation | subsidiary     2