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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Goodwill [Line Items]
Beginning balance	$ 24,917	[1]
Goodwill disposal	(28)
Translation differences	(232)
Ending balance	24,657	[1]
North America [Member]
Goodwill [Line Items]
Beginning balance	11,098	[1]
Goodwill disposal	(23)
Translation differences	11
Ending balance	11,086	[1]
Europe [Member]
Goodwill [Line Items]
Beginning balance	8,653	[1]
Goodwill disposal	(5)
Translation differences	(300)
Ending balance	8,348	[1]
International Markets [Member]
Goodwill [Line Items]
Beginning balance	2,479	[1]
Translation differences	57
Ending balance	2,536	[1]
Other [Member]
Goodwill [Line Items]
Beginning balance	2,687	[1]
Ending balance	$ 2,687	[1]
[1] Accumulated goodwill impairment as of September 30, 2019 and January 1, 2019 was approximately $21.0 billion.

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
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