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FINANCIAL INSTRUMENTS - Schedule of Financial Statement Effects - Economic Hedges (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Change in fair value of economic hedge increase (decrease) $ 979 $ 157 $ 641 $ (122)
Change in carrying amount of item being hedged increase (decrease) (1,180) (286) (956) (198)
Earnings (loss) effect $ (200) $ (130) $ (315) $ (321)