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COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - WMC Legal Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]                
Claims reflecting purchase price or unpaid principal balances of the loans at the time of purchase $ 1,182     $ 1,182        
Potential Violation of FIRREA by WMC and GE Capital                
Loss Contingencies [Line Items]                
Reserve provision   $ 1,500            
Disposed of by Sale | WMC                
Loss Contingencies [Line Items]                
Active claims for alleged breaches of representations and warranties on mortgage loans 307     307   $ 462    
Additional claims asserted against WMC in litigation without making a prior claim 875     875   3,198    
Reserves 294 $ 342 $ 636 294 $ 636 $ 416 $ 626 $ 626
Net decrease to reserves due to settlements       122        
Reserve provision 5   $ 10 5 $ 10      
Disposed of by Sale | WMC | Minimum                
Loss Contingencies [Line Items]                
Estimate of possible loss 0     0        
Disposed of by Sale | WMC | Maximum                
Loss Contingencies [Line Items]                
Estimate of possible loss $ 500     $ 500