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FINANCIAL INSTRUMENTS - Effects of Derivatives on Earnings (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Total effect on earnings $ (702) $ (528)  
Carrying value of net investment hedges (13,028) (13,355)  
Total pre-tax reclassifications from CTA to gain (loss) 125 (528)  
Total pre-tax reclassifications from CTA to gain (loss) recorded in discontinued operations 125 (529)  
Cash flow hedges      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Effect on hedging instrument 199 (274)  
Effect on underlying (199) 274 $ 913
Effect on earnings 0 1  
Effect on earnings 149 (364) $ (918)
Fair value hedges      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Effect on hedging instrument (556) 170  
Effect on underlying 371 (433)  
Effect on earnings (185) (263)  
Net investment hedges      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Effect on hedging instrument (1,833) 2,458  
Effect on underlying 1,852 (2,376)  
Effect on earnings 19 82  
Economic hedges      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Effect on hedging instrument 1,147 (2,132)  
Effect on underlying (1,683) 1,784  
Effect on earnings $ (536) $ (348)