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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Beginning balance					$ 28,414	$ 44,409
Goodwill adjustments						920
Goodwill disposal					(79)	(697)
Goodwill impairment			$ (11,000)	$ (6,100)	(3,027)	(17,100)	$ (900)
Goodwill reclassified as assets to held for sale					(20)	(275)
Translation differences					(371)	1,157
Ending balance	$ 24,917		28,414		24,917	28,414	44,409
Relative fair value allocation						(28,414)
Generics [Member]
Goodwill [Line Items]
Beginning balance					18,864	32,863
Goodwill adjustments						1,480
Goodwill disposal						(7)
Goodwill impairment						(16,500)
Translation differences						1,028
Ending balance			18,864			18,864	32,863
Relative fair value allocation						(18,864)
Specialty [Member]
Goodwill [Line Items]
Beginning balance					8,464	9,323
Goodwill disposal						(690)
Goodwill reclassified as assets to held for sale						(275)
Translation differences						106
Ending balance			8,464			8,464	9,323
Relative fair value allocation						(8,464)
Other Segments [Member]
Goodwill [Line Items]
Beginning balance					1,086	2,223
Goodwill adjustments						(560)
Goodwill impairment						(600)
Translation differences						23
Ending balance			1,086			1,086	$ 2,223
Relative fair value allocation						(1,086)
North America [Member]
Goodwill [Line Items]
Beginning balance					11,144
Translation differences					(46)
Ending balance	11,098		11,144		11,098	11,144
Relative fair value allocation						11,144
Europe [Member]
Goodwill [Line Items]
Beginning balance					9,001
Goodwill disposal					(65)
Goodwill reclassified as assets to held for sale					(3)
Translation differences					(280)
Ending balance	8,653		9,001		8,653	9,001
Relative fair value allocation						9,001
International Markets [Member]
Goodwill [Line Items]
Beginning balance					5,404
Goodwill disposal					(14)
Goodwill impairment	(2,530)	$ 0			(2,834)
Translation differences					(77)
Ending balance	2,479		5,404		2,479	5,404
Relative fair value allocation						5,404
Other [Member]
Goodwill [Line Items]
Beginning balance					2,865
Goodwill impairment					(193)
Goodwill reclassified as assets to held for sale					(17)
Translation differences					32
Ending balance	$ 2,687		$ 2,865		$ 2,687	2,865
Relative fair value allocation						$ 2,865

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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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