SUPPLEMENTAL INFORMATION - Schedule of Cash Flow Hedge Activity (Details) - Cash Flow Hedges - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	$ (225)	$ (2)	$ (281)	$ 43
Gain (loss) reclassified from AOCI into earnings	104	(57)	167	(128)
Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	225	2	281	(43)
Gain (loss) reclassified from AOCI into earnings	104	(57)	167	(128)
Hedges \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	1	1	3	32
Gain (loss) reclassified from AOCI into earnings	(6)	(12)	(21)	(67)
Hedges \| Currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	224	0	278	(76)
Gain (loss) reclassified from AOCI into earnings	110	(46)	189	(59)
Hedges \| Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	0	1	0	1
Gain (loss) reclassified from AOCI into earnings	$ 0	$ 0	$ 0	$ (3)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

+ References

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=64837297&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=64837297&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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