FINANCIAL INSTRUMENTS - Cash Flow Hedge Activity (Details) - Cash flow hedges - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Gain (loss) recognized in AOCI	$ 199	$ (274)	$ (913)
Gain (loss) reclassified from AOCI into earnings	149	(364)	(918)
Interest rate contracts
Derivative [Line Items]
Gain (loss) recognized in AOCI	4	6	(1)
Gain (loss) reclassified from AOCI into earnings	(27)	(79)	(130)
Currency exchange contracts
Derivative [Line Items]
Gain (loss) recognized in AOCI	195	(281)	(907)
Gain (loss) reclassified from AOCI into earnings	176	(282)	(784)
Commodity contracts
Derivative [Line Items]
Gain (loss) recognized in AOCI	0	0	(5)
Gain (loss) reclassified from AOCI into earnings	$ 0	$ (2)	$ (4)

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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