EQUITY - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from Accumulated other comprehensive loss			$ 75
Net current-period Other comprehensive (loss) income	$ (624)	$ 323	(328)	$ 586
Currency translation and related hedging instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(2,255)
Other comprehensive (loss) income before reclassifications			(414)
Amounts reclassified from Accumulated other comprehensive loss			0
Net current-period Other comprehensive (loss) income			(414)
Ending balance	(2,669)		(2,669)
Pensions and other postretirement benefits [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(1,139)
Other comprehensive (loss) income before reclassifications			13
Amounts reclassified from Accumulated other comprehensive loss			69
Net current-period Other comprehensive (loss) income			82
Ending balance	(1,057)		(1,057)
Cash flow hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(10)
Other comprehensive (loss) income before reclassifications			(2)
Amounts reclassified from Accumulated other comprehensive loss			6
Net current-period Other comprehensive (loss) income			4
Ending balance	(6)		(6)
Total AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(3,404)
Other comprehensive (loss) income before reclassifications			(403)
Amounts reclassified from Accumulated other comprehensive loss			75
Net current-period Other comprehensive (loss) income			(328)
Ending balance	$ (3,732)		$ (3,732)