FINANCIAL INSTRUMENTS AND NON-RECURRING FAIR VALUE MEASUREMENTS - Schedule of Effects of Derivatives on Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effect on earnings	$ (298)	$ (355)	$ (717)	$ (715)
Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effect on hedging instrument	225	2	281	(43)
Effect on underlying	(225)	(2)	(281)	43
Effect on earnings	0	0	0	0
Fair value hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effect on hedging instrument	(148)	(116)	(430)	2,494
Effect on underlying	103	37	267	(2,651)
Effect on earnings	(45)	(79)	(162)	(156)
Net investment hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effect on hedging instrument	(1,016)	582	(2,065)	580
Effect on underlying	1,020	(552)	2,082	(513)
Effect on earnings	4	30	17	67
Economic hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effect on hedging instrument	663	(686)	1,304	(808)
Effect on underlying	(920)	380	(1,876)	182
Effect on earnings	$ (257)	$ (306)	$ (572)	$ (626)