EQUITY (Other Comprehensive Income/(Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Other Comprehensive Income (Loss), before Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ 97	$ 45
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(20)	(30)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	77	15
Pension and postretirement benefits - Actuarial gains/(losses), Pre-tax	8	(2)
Pension and postretirement benefits - Amortization, Pre-tax	9	17
Pension and postretirement benefits - Curtailments and settlements, Pre-Tax	2	49
Pension and postretirement benefits, Pre-tax	19	64
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax	2	23
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	3
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	2	26
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(110)	32
Other Comprehensive Income/(Loss), Pre-tax	(12)	137
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(10)	(5)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	3	4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(7)	(1)
Pension and postretirement benefits - Actuarial gains/(losses), Tax	(2)	0
Pension and postretirement benefits - Amortization, Tax	(1)	(4)
Pension and postretirement benefits - Curtailments and settlements, Tax	0	(11)
Pension and postretirement benefits, Tax	(3)	(15)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	(1)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	(1)	0
Foreign currency translation, Tax	(6)	(3)
Other comprehensive income/(loss), Tax	(17)	(19)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	87	40
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(17)	(26)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	70	14
Pension and postretirement benefits - Actuarial gains/(losses), After tax	6	(2)
Pension and postretirement benefits - Amortization, After tax	8	13
Pension and postretirement benefits - Curtailments and settlements, After tax	2	38
Pension and postretirement benefits, After tax	16	49
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	1	23
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	3
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	1	26
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(116)	29
Other Comprehensive Income/(Loss)	(29)	$ 118
Derivatives qualifying as cash flow hedges	89		$ 19
Pension and postretirement benefits	(883)		(899)
Available-for-sale securities	7		6
Foreign currency translation	(762)		(646)
Accumulated other comprehensive loss	$ (1,549)		$ (1,520)