EQUITY (Other Comprehensive Income/(Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Other Comprehensive Income (Loss), before Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ (6)	$ 83	$ 39	$ 45
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(26)	13	(56)	33
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	(32)	96	(17)	78
Pension and postretirement benefits - Actuarial gains/(losses), Pre-tax	(12)	0	(14)	112
Pension and postretirement benefits - Amortization, Pre-tax	16	16	33	36
Pension and postretirement benefits - Curtailments and settlements, Pre-Tax	44	38	93	69
Pension and postretirement benefits, Pre-tax	48	54	112	217
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax	13	(8)	36	(40)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax			3	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax			39	(40)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(3)	(204)	29	(211)
Other Comprehensive Income/(Loss), Pre-tax	26	(62)	163	44
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	1	(10)	(4)	(4)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	3	(1)	7	(8)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	4	(11)	3	(12)
Pension and postretirement benefits - Actuarial gains/(losses), Tax	3	0	3	(24)
Pension and postretirement benefits - Amortization, Tax	(2)	(3)	(6)	(6)
Pension and postretirement benefits - Curtailments and settlements, Tax	(10)	(8)	(21)	(15)
Pension and postretirement benefits, Tax	(9)	(11)	(24)	(45)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	0	1	0	7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax			0	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax			0	7
Foreign currency translation, Tax	2	(17)	(1)	(5)
Other comprehensive income/(loss), Tax	(3)	(38)	(22)	(55)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(5)	73	35	41
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(23)	12	(49)	25
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(28)	85	(14)	66
Pension and postretirement benefits - Actuarial gains/(losses), After tax	(9)	0	(11)	88
Pension and postretirement benefits - Amortization, After tax	14	13	27	30
Pension and postretirement benefits - Curtailments and settlements, After tax	34	30	72	54
Pension and postretirement benefits, After tax	39	43	88	172
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	13	(7)	36	(33)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax			3	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	13	(7)	39	(33)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(1)	(221)	28	(216)
Other Comprehensive Income/(Loss)	23	$ (100)	141	$ (11)
Derivatives qualifying as cash flow hedges	37		37		$ 51
Pension and postretirement benefits	(2,014)		(2,014)		(2,102)
Available-for-sale securities	9		9		(30)
Foreign currency translation	(653)		(653)		(681)
Accumulated other comprehensive loss	$ (2,621)		$ (2,621)		$ (2,762)