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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 9 Months Ended
Dec. 31, 2014
USD ($)
Jan. 31, 2007
EUR (€)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
significant_case
lawsuit
securitization
Sep. 30, 2016
USD ($)
Oct. 26, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 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      
Number of securitizations related to lawsuits | securitization         11              
Reserves related to repurchase claims     647 $ 665 $ 647 $ 665   $ 636 $ 626 $ 860 $ 875  
Net increase to reserves     11 $ 0 $ 21 $ 84            
Number of lawsuits arising from alleged breaches of representations and warranties | lawsuit         10              
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 | Lawsuits 1, 2, 3, 4, & 5                        
Loss Contingencies [Line Items]                        
Number of lawsuits arising from alleged breaches of representations and warranties | lawsuit         5              
Disposed of by sale | WMC | Lawsuit 6                        
Loss Contingencies [Line Items]                        
Number of lawsuits arising from alleged breaches of representations and warranties | lawsuit         1              
Disposed of by sale | WMC | Lawsuit 7                        
Loss Contingencies [Line Items]                        
Number of securitizations related to lawsuits | securitization         2              
Number of lawsuits arising from alleged breaches of representations and warranties | lawsuit         1              
Disposed of by sale | WMC | Lawsuits 8, 9, & 10                        
Loss Contingencies [Line Items]                        
Number of lawsuits arising from alleged breaches of representations and warranties | lawsuit         3              
Settled and subsequently dismissed | Disposed of by sale | WMC                        
Loss Contingencies [Line Items]                        
Number of securitizations related to lawsuits | securitization         5              
Pending outcome of ongoing settlement negotiations | Disposed of by sale | WMC | Lawsuits 8 & 9                        
Loss Contingencies [Line Items]                        
Number of lawsuits arising from alleged breaches of representations and warranties | lawsuit         2              
Subsequent Event | Disposed of by sale | WMC                        
Loss Contingencies [Line Items]                        
Active claims for alleged breaches of representations and warranties on mortgage loans             $ 462          
Additional claims asserted against WMC in litigation without making a prior claim             $ 3,198