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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Line Items]
Beginning balance	[1]			$ 24,846
Goodwill reclassified as assets to held for sale				(27)
Goodwill impairment		$ (4,628)	$ 0	(4,628)	$ 0
Translation differences				37
Ending balance	[1]	20,228		20,228
North America [Member]
Goodwill [Line Items]
Beginning balance	[1]			11,091
Goodwill impairment				(4,628)
Translation differences				(10)
Ending balance	[1]	6,453		6,453
Europe [Member]
Goodwill [Line Items]
Beginning balance	[1]			8,536
Goodwill reclassified as assets to held for sale				(8)
Translation differences				253
Ending balance	[1]	8,781		8,781
International Markets [Member]
Goodwill [Line Items]
Beginning balance	[1]			2,532
Goodwill reclassified as assets to held for sale				(19)
Translation differences				(206)
Ending balance	[1]	2,307		2,307
Other [Member]
Goodwill [Line Items]
Beginning balance	[1]			2,687
Ending balance	[1]	$ 2,687		$ 2,687
[1] Accumulated goodwill impairment as of September 30, 2020 and December 31, 2019 was approximately $25.6 billion and $21.0 million, respectively.

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Goodwill reclassification.

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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.

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

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