EQUITY (Other Comprehensive Income/(Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Other Comprehensive Income (Loss), before Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ 259	$ 97
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	36	(20)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	295	77
Pension and postretirement benefits - Actuarial gains/(losses), Pre-tax	21	8
Pension and postretirement benefits - Amortization, Pre-tax	9	9
Pension and postretirement benefits - Curtailments and settlements, Pre-Tax	1	2
Pension and postretirement benefits, Pre-tax	31	19
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	(3)	2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	9	(110)
Other Comprehensive Income/(Loss), Pre-tax	332	(12)
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(11)	(10)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(4)	3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(15)	(7)
Pension and postretirement benefits - Actuarial gains/(losses), Tax	(5)	(2)
Pension and postretirement benefits - Amortization, Tax	(3)	(1)
Pension and postretirement benefits - Curtailments and settlements, Tax	0	0
Pension and postretirement benefits, Tax	(8)	(3)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax	1	(1)
Foreign currency translation, Tax	(15)	(6)
Other comprehensive income/(loss), Tax	(37)	(17)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	248	87
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	32	(17)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	280	70
Pension and postretirement benefits - Actuarial gains/(losses), After tax	16	6
Pension and postretirement benefits - Amortization, After tax	6	8
Pension and postretirement benefits - Curtailments and settlements, After tax	1	2
Pension and postretirement benefits, After tax	23	16
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(2)	1
Foreign currency translation	(6)	(116)
Other Comprehensive (Loss)/Income	295	$ (29)
Derivatives qualifying as cash flow hedges	43		$ (237)
Pension and postretirement benefits	(951)		(974)
Available-for-sale securities	9		11
Foreign currency translation	(645)		(639)
Accumulated other comprehensive loss	$ (1,544)		$ (1,839)