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CONTINGENCIES (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jan. 29, 2020
EUR (€)
Dec. 13, 2019
USD ($)
Apr. 30, 2019
USD ($)
May 31, 2018
USD ($)
Dec. 31, 2015
EUR (€)
Dec. 31, 2014
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Dec. 31, 2019
USD ($)
Contingencies                  
Possible unaccrued loss                 $ 1,300
Tribune Company bankruptcy                  
Contingencies                  
Business acquisition price LBO               $ 11,000  
Frontpoint Asian Event Driven Fund v. Citibank                  
Contingencies                  
Settlement amount awarded to other party       $ 10          
Interchange Fees Litigation                  
Contingencies                  
Settlement amount awarded to other party           $ 6,050      
Period of collecting interchange fees           8 months      
Damages awarded   $ 6,240              
Reduction in settlement amount awarded to other party   $ 700              
Parmalat                  
Contingencies                  
Damages awarded     $ 431       $ 431    
Parmalat | Milan Court of Appeal | Citibank, N.A.                  
Contingencies                  
Loss contingency damages sought | €         € 1,800        
Subsequent event | Parmalat | Milan Court of Appeal | Citibank, N.A.                  
Contingencies                  
Potential reduction in value of damages sought | € € 990