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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Line Items]
Beginning balance	$ 24,846	[1]
Goodwill reclassified as assets to held for sale	(11)
Translation differences	(219)
Ending balance	24,616	[1]
North America [Member]
Goodwill [Line Items]
Beginning balance	11,091	[1]
Goodwill reclassified as assets to held for sale
Translation differences	(17)
Ending balance	11,074	[1]
Europe [Member]
Goodwill [Line Items]
Beginning balance	8,536	[1]
Goodwill reclassified as assets to held for sale
Translation differences	(33)
Ending balance	8,503	[1]
International Markets [Member]
Goodwill [Line Items]
Beginning balance	2,532	[1]
Goodwill reclassified as assets to held for sale	(11)
Translation differences	(169)
Ending balance	2,352	[1]
Other [Member]
Goodwill [Line Items]
Beginning balance	2,687	[1]
Goodwill reclassified as assets to held for sale
Translation differences
Ending balance	$ 2,687	[1]
[1] Accumulated goodwill impairment as of June 30, 2020 and December 31, 2019 was approximately $21.0 billion.

X

- Definition

Goodwill reclassification.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

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.

+ References

No definition available.

+ Details

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