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COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - OTHER LOSS CONTINGENCIES (Narrative) (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 23, 2017
USD ($)
Dec. 31, 2014
USD ($)
Jan. 31, 2007
EUR (€)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
securitization
lawsuit
significant_case
Jun. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 02, 2015
USD ($)
Loss Contingencies [Line Items]                        
Claims reflecting purchase price or unpaid principal balances of the loans at the time of purchase       $ 6,454   $ 6,454            
Period prior to notifying WMC when claim would be disallowed           6 years            
Number of significant cases involving anti-competitive activities and improper payments | significant_case           2            
Fine for participating in gas insulated switchgear cartel (in euros) | €     € 65                  
Reduced fine (in euros) | €     € 59                  
Criminal penalty paid   $ 772                    
Reserve established for legal and compliance matters                       $ 858
Disposed of by Sale | WMC                        
Loss Contingencies [Line Items]                        
Active claims for alleged breaches of representations and warranties on mortgage loans       1,019   $ 1,019     $ 1,060      
Additional claims asserted against WMC in litigation without making a prior claim       5,435   5,435     5,456      
Reserves related to repurchase claims       636 $ 860 636 $ 860 $ 626 $ 626 $ 833 $ 875  
Net increase to reserves       10 $ 27 $ 10 $ 84          
Number of lawsuits arising from alleged breaches of representations and warranties | lawsuit           10            
Number of securitizations related to lawsuits | securitization           11            
Number number of lawsuits that are the subject of settlement agreements | lawsuit           5            
Disposed of by Sale | WMC | Lower limit                        
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            
Disposed of by Sale | WMC | ResCap Liquidating Trust                        
Loss Contingencies [Line Items]                        
Sale of loans to RFC $ 840