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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Line Items]
Beginning balance	$ 20,624	[1]
Goodwill reclassified as assets to held for sale	(7)
Translation differences	(196)
Ending balance	20,421	[1]
North America [Member]
Goodwill [Line Items]
Beginning balance	6,473	[1]
Translation differences	12
Ending balance	6,485	[1]
Europe [Member]
Goodwill [Line Items]
Beginning balance	9,102	[1]
Goodwill reclassified as assets to held for sale	(7)
Translation differences	(198)
Ending balance	8,897	[1]
International Markets [Member]
Goodwill [Line Items]
Beginning balance	2,362	[1]
Translation differences	(10)
Ending balance	2,352	[1]
Other [Member]
Goodwill [Line Items]
Beginning balance	2,687	[1]
Ending balance	$ 2,687	[1]
[1] Accumulated goodwill impairment as of June 30, 2021 and December 31, 2020 was approximately $25.6 billion.

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- Definition

Goodwill reclassification.

+ References

No definition available.

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- 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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: 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=120320667&loc=SL49117168-202975

Reference 3: 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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- 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=121556970&loc=d3e13816-109267

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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.

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