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PLEDGED ASSETS, COLLATERAL, GUARANTEES AND COMMITMENTS - Lease Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pledged Assets, Collateral, Guarantees and Commitments [Abstract]      
Rental expense $ 1,100 $ 1,100 $ 1,300
Future Minimum Annual Rentals      
2018 968    
2019 837    
2020 676    
2021 568    
2022 469    
Thereafter 2,593    
Total $ 6,111