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BUSINESSES HELD FOR SALE AND DISCONTINUED OPERATIONS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Nov. 13, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from disposal of business   $ 5,564 $ 3,030  
Assets planned to be disposed of       $ 20,000
Disposed of by Sale | Capital | Energy Financial Services        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from disposal of business $ 2,000      
Pre-tax gain (loss) on disposal 285      
Held for Sale, Not Discontinued Operation        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pre-tax gain (loss) on disposal   (565)    
Cumulative pre-tax loss on the planned disposals 1,598 1,598    
Cumulative loss on planned disposals, net of tax 1,489 1,489    
Held for Sale, Not Discontinued Operation | Power | Industrial Solutions        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pre-tax gain (loss) on disposal   458    
Consideration received 3,439 3,439    
Liquidation of valuation allowance $ 546 $ 546