GOODWILL (Details) - Goodwill - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Reconciliation of changes in intangible assets and goodwill [abstract]
Balance at beginning of period	$ 5,218	$ 2,411
Acquisitions through business combinations	(137)
Acquisitions through business combinations		3,444
Impairment losses	0	(418)
Dispositions	0	(21)
Assets reclassified as held for sale	0	(212)
Foreign currency translation	(45)	14
Balance at end of period	$ 5,036	$ 5,218

The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The decrease in intangible assets and goodwill resulting from classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The decrease in intangible assets and goodwill resulting from disposals. [Refer: Intangible assets and goodwill]

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The amount of impairment loss recognised in profit or loss for intangible assets and goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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No definition available.

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The decrease in goodwill resulting from the subsequent recognition of deferred tax assets during the measurement period for a business combination. [Refer: Goodwill; Deferred tax assets; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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