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ACQUISITIONS (Ownership Restructure of Dow Corning) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 01, 2016
May 31, 2016
Aug. 31, 2016
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]              
Equity method investments         $ 3,823 $ 3,742  
Goodwill         13,848 $ 13,938 $ 15,272
Dow Silicones Corporation              
Business Acquisition [Line Items]              
Percentage of voting interests acquired 50.00%            
Payments to acquire Businesses $ 4,800            
Remeasurement gain       $ 2,445 $ 47    
Recognized tax benefit       $ (141)      
Step-Up inventories acquired     $ 317        
Goodwill 3,229            
Dow Silicones Corporation              
Business Acquisition [Line Items]              
Equity method investments $ 1,968            
Ownership percentage   50.00%          
Dow Silicones Corporation              
Business Acquisition [Line Items]              
Proceeds from issuance of debt   $ 4,500          
Dow Silicones Corporation | Corning Incorporated | SplitCo              
Business Acquisition [Line Items]              
Noncontrolling interest, ownership percentage by parent 100.00%