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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Goodwill [Line Items]
Beginning balance	$ 20,624	[1]
Goodwill reclassified as assets to held for sale	(13)
Translation differences	(432)
Ending balance	20,179	[1]
North America [Member]
Goodwill [Line Items]
Beginning balance	6,473	[1]
Translation differences	0
Ending balance	6,473	[1]
Europe [Member]
Goodwill [Line Items]
Beginning balance	9,102	[1]
Goodwill reclassified as assets to held for sale	(7)
Translation differences	(388)
Ending balance	8,707	[1]
International Markets [Member]
Goodwill [Line Items]
Beginning balance	2,362	[1]
Translation differences	(44)
Ending balance	2,318	[1]
Other [Member]
Goodwill [Line Items]
Beginning balance	2,687	[1]
Goodwill reclassified as assets to held for sale	(6)
Ending balance	$ 2,681	[1]
[1] Accumulated goodwill impairment as of September 30, 2021 and December 31, 2020 was approximately $25.6 billion.

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Goodwill reclassification.

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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
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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.

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