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ACQUISITIONS, GOODWILL AND OTHER INTANGIBLE ASSETS - ACQUISITIONS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 23, 2017
Apr. 20, 2017
Sep. 14, 2016
Aug. 16, 2016
May 10, 2016
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]                  
Payment for acquisition             $ 6,053 $ 930  
Goodwill             $ 87,068   $ 70,438
LM Wind Power                  
Business Acquisition [Line Items]                  
Payment for acquisition   $ 1,700              
Goodwill   1,300              
Amortizable intangible assets   $ 200              
ServiceMax                  
Business Acquisition [Line Items]                  
Payment for acquisition           $ 867      
Goodwill           670      
Amortizable intangible assets           $ 280      
Ownership interest acquired (as a percent)           96.00%      
Cash acquired           $ 91      
Previously held equity interest (as a percent)           4.00%      
Meridium Inc.                  
Business Acquisition [Line Items]                  
Goodwill     $ 360            
Amortizable intangible assets     $ 150            
Ownership interest acquired (as a percent)     74.00%            
Cash paid for acquisition     $ 369            
Previously held equity interest (as a percent)     26.00%            
Doosan Engineering & Construction                  
Business Acquisition [Line Items]                  
Payment for acquisition       $ 220 $ 250        
Goodwill $ 160                
Amortizable intangible assets $ 36                
Ownership interest acquired (as a percent) 15.00%                
Previously held equity interest (as a percent)       80.00%          
Consideration for remaining HRSG business $ 35                
Remaining business subject to local regulatory requirements (as a percent) 5.00%