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ACQUISITIONS, GOODWILL AND OTHER INTANGIBLE ASSETS - GOODWILL (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
reporting_unit
Dec. 31, 2016
USD ($)
Business Combinations [Abstract]      
Increase in goodwill balances   $ 16,630  
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Goodwill $ 87,068 $ 87,068 $ 70,438
Lower limit      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rate used in reporting unit valuations   10.00%  
Upper limit      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rate used in reporting unit valuations   18.00%  
Power      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Non-cash, non-tax deductible goodwill impairment loss, before tax 947    
Non-cash, non-tax deductible goodwill impairment loss, net of tax 940    
Implied fair value 191 $ 191  
Number of reporting units for which the fair value was not substantially in excess of its carrying value | reporting_unit   1  
Goodwill $ 25,239 $ 25,239 $ 26,403
Goodwill of Grid Solutions reporting unit (as a percent) 5.00% 5.00%  
Power Conversion | Power      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair value in excess of carrying value (as a percent) 2.00% 2.00%  
Grid Solutions | Power      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair value in excess of carrying value (as a percent) 3.00% 3.00%  
Goodwill $ 4,418 $ 4,418