EQUITY - AOCI (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance			$ 7,148
Balance	$ 6,280		6,280
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(6,795)	$ (5,951)	(5,930)	$ (5,978)
Other comprehensive income (loss) before reclassifications	(177)	301	(1,055)	347
Amount reclassified from accumulated other comprehensive income	14	(12)	27	(31)
Balance	(6,958)	(5,662)	(6,958)	(5,662)
Foreign Exchange Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(6,576)	(5,618)	(5,547)	(5,734)
Other comprehensive income (loss) before reclassifications	(182)	329	(1,225)	445
Amount reclassified from accumulated other comprehensive income	15	0	29	0
Balance	(6,743)	(5,289)	(6,743)	(5,289)
Deferred Gains (Losses) on Hedging Activities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(80)	(192)	(244)	(102)
Other comprehensive income (loss) before reclassifications	8	(37)	172	(108)
Amount reclassified from accumulated other comprehensive income	(1)	(8)	(1)	(27)
Balance	(73)	(237)	(73)	(237)
Pension and Other Postretirement Liability Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(139)	(145)	(140)	(145)
Other comprehensive income (loss) before reclassifications	(3)	9	(2)	9
Amount reclassified from accumulated other comprehensive income	0	0	0	0
Balance	(142)	(136)	(142)	(136)
Unrealized Gains (Losses) on Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	0	4	1	3
Other comprehensive income (loss) before reclassifications	0	0	0	1
Amount reclassified from accumulated other comprehensive income	0	(4)	(1)	(4)
Balance	$ 0	$ 0	$ 0	$ 0

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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