STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 115	$ 149
Sundry income (expense) - net	73	83
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(1)	2
Reclassification from AOCI, Current Period, Tax	0	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1)	1
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sundry income (expense) - net	(18)	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	166	154
Reclassification from AOCI, Current Period, Tax	(25)	(28)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	141	126
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(7)	27
Reclassification from AOCI, Current Period, Tax	0	(5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (7)	$ 22