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Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill [Line Items]
Beginning balance		$ 28,414	$ 28,414
Goodwill impairment			(300)	$ (6,100)
Ending balance	$ 27,585		27,585		$ 28,414
Europe [Member]
Goodwill [Line Items]
Goodwill impairment	0
International Markets [Member]
Goodwill [Line Items]
Goodwill impairment	0	0
Operating Segments [Member]
Goodwill [Line Items]
Beginning balance				28,414	28,414
Relative fair value allocation					(28,414)
Operating Segments [Member] | Generics [Member]
Goodwill [Line Items]
Beginning balance				18,864	18,864
Relative fair value allocation					(18,864)
Operating Segments [Member] | Specialty [Member]
Goodwill [Line Items]
Beginning balance				8,464	8,464
Relative fair value allocation					(8,464)
Operating Segments [Member] | Other Segments [Member]
Goodwill [Line Items]
Beginning balance				$ 1,086	1,086
Relative fair value allocation					(1,086)
Reportable Geographical Components [Member]
Goodwill [Line Items]
Beginning balance		28,414	28,414
Goodwill impairment			(300)
Relative fair value allocation					28,414
Goodwill disposal			(79)
Goodwill reclassified as assets to held for sale			(40)
Translation differences			(410)
Ending balance	27,585		27,585		28,414
Reportable Geographical Components [Member] | Other Segments [Member]
Goodwill [Line Items]
Beginning balance		2,865	2,865
Relative fair value allocation					2,865
Goodwill reclassified as assets to held for sale			(40)
Translation differences			(1)
Ending balance	2,824		2,824		2,865
Reportable Geographical Components [Member] | North America [Member]
Goodwill [Line Items]
Beginning balance		11,144	11,144
Relative fair value allocation					11,144
Translation differences			(21)
Ending balance	11,123		11,123		11,144
Reportable Geographical Components [Member] | Europe [Member]
Goodwill [Line Items]
Beginning balance		9,001	9,001
Relative fair value allocation					9,001
Goodwill disposal			(65)
Translation differences			(338)
Ending balance	8,598		8,598		9,001
Reportable Geographical Components [Member] | International Markets [Member]
Goodwill [Line Items]
Beginning balance		$ 5,404	5,404
Goodwill impairment			(300)
Relative fair value allocation					5,404
Goodwill disposal			(14)
Translation differences			(50)
Ending balance	$ 5,040		$ 5,040		$ 5,404

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Goodwill Fair Value Allocation

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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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Amount of divestiture 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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