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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill, Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Goodwill [Line Items]            
Goodwill impairments $ 740,000,000   $ 21,973,000,000 $ 1,484,000,000 $ 21,973,000,000  
Goodwill 26,666,000,000     26,666,000,000   $ 33,974,000,000
Additive Reporting Unit            
Goodwill [Line Items]            
Goodwill 1,097,000,000     1,097,000,000    
Capital            
Goodwill [Line Items]            
Goodwill 839,000,000     839,000,000    
Grid Solutions equipment and services            
Goodwill [Line Items]            
Goodwill impairments   $ 744,000,000        
Goodwill   0        
Power Generation and Grid Solutions            
Goodwill [Line Items]            
Goodwill impairments     $ 21,973,000,000     22,136,000,000
Hydro Reporting Unit            
Goodwill [Line Items]            
Goodwill impairments 740,000,000          
Goodwill 0     0    
Operating Segments | Power            
Goodwill [Line Items]            
Goodwill impairments       0    
Goodwill 145,000,000     145,000,000   139,000,000
Goodwill transfers in (out)   (1,618,000,000)        
Operating Segments | Renewable Energy            
Goodwill [Line Items]            
Goodwill impairments       1,484,000,000    
Goodwill 3,279,000,000     3,279,000,000   4,730,000,000
Goodwill transfers in (out)   744,000,000        
Corporate            
Goodwill [Line Items]            
Goodwill impairments       0    
Goodwill $ 873,000,000     $ 873,000,000   $ 1,136,000,000
Goodwill transfers in (out)   $ 874,000,000        
Discount rate | Minimum            
Goodwill [Line Items]            
Goodwill, measurement input 0.096     0.096    
Discount rate | Maximum            
Goodwill [Line Items]            
Goodwill, measurement input 0.220     0.220