EQUITY (Other Comprehensive Income/(Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Other Comprehensive Income (Loss), before Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ (34)	$ (6)	$ 63	$ 39
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(32)	(26)	(52)	(56)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	(66)	(32)	11	(17)
Pension and postretirement benefits - Actuarial gains/(losses), Pre-tax	(20)	(12)	(12)	(14)
Pension and postretirement benefits - Amortization, Pre-tax	9	16	18	33
Pension and postretirement benefits - Curtailments and settlements, Pre-Tax	2	44	4	93
Pension and postretirement benefits, Pre-tax	(9)	48	10	112
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax	12	13	14	36
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	(1)	0	(1)	3
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	11	13	13	39
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	45	(3)	(65)	29
Other Comprehensive Income/(Loss), Pre-tax	(19)	26	(31)	163
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	4	1	(6)	(4)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	3	3	6	7
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	7	4	0	3
Pension and postretirement benefits - Actuarial gains/(losses), Tax	5	3	3	3
Pension and postretirement benefits - Amortization, Tax	(2)	(2)	(3)	(6)
Pension and postretirement benefits - Curtailments and settlements, Tax	(1)	(10)	(1)	(21)
Pension and postretirement benefits, Tax	2	(9)	(1)	(24)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	(3)	0	(4)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	0	0	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	(3)	0	(4)	0
Foreign currency translation, Tax	6	2	0	(1)
Other comprehensive income/(loss), Tax	12	(3)	(5)	(22)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(30)	(5)	57	35
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(29)	(23)	(46)	(49)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(59)	(28)	11	(14)
Pension and postretirement benefits - Actuarial gains/(losses), After tax	(15)	(9)	(9)	(11)
Pension and postretirement benefits - Amortization, After tax	7	14	15	27
Pension and postretirement benefits - Curtailments and settlements, After tax	1	34	3	72
Pension and postretirement benefits, After tax	(7)	39	9	88
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	9	13	10	36
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(1)	0	(1)	3
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	8	13	9	39
Foreign currency translation	51	(1)	(65)	28
Other Comprehensive (Loss)/Income	(7)	$ 23	(36)	$ 141
Derivatives qualifying as cash flow hedges	30		30		$ 19
Pension and postretirement benefits	(890)		(890)		(899)
Available-for-sale securities	15		15		6
Foreign currency translation	(711)		(711)		(646)
Accumulated other comprehensive loss	$ (1,556)		$ (1,556)		$ (1,520)