Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Beginning balance	$ 28,414
Goodwill impairment	(180)
Ending balance	28,465	$ 28,414
Operating Segments [Member]
Goodwill [Line Items]
Beginning balance		28,414
Relative fair value allocation		(28,414)
Operating Segments [Member] \| Generics [Member]
Goodwill [Line Items]
Beginning balance		18,864
Relative fair value allocation		(18,864)
Operating Segments [Member] \| Specialty [Member]
Goodwill [Line Items]
Beginning balance		8,464
Relative fair value allocation		(8,464)
Operating Segments [Member] \| Other Segments [Member]
Goodwill [Line Items]
Beginning balance		1,086
Relative fair value allocation		(1,086)
Reportable Geographical Components [Member]
Goodwill [Line Items]
Beginning balance	28,414
Goodwill impairment	(180)
Relative fair value allocation		28,414
Goodwill disposal	(54)
Translation differences	285
Ending balance	28,465	28,414
Reportable Geographical Components [Member] \| Other Segments [Member]
Goodwill [Line Items]
Beginning balance	2,865
Relative fair value allocation		2,865
Translation differences	1
Ending balance	2,866	2,865
Reportable Geographical Components [Member] \| North America [Member]
Goodwill [Line Items]
Beginning balance	11,144
Relative fair value allocation		11,144
Translation differences	(13)
Ending balance	11,131	11,144
Reportable Geographical Components [Member] \| Europe [Member]
Goodwill [Line Items]
Beginning balance	9,001
Relative fair value allocation		9,001
Goodwill disposal	(54)
Translation differences	269
Ending balance	9,216	9,001
Reportable Geographical Components [Member] \| Growth Markets [Member]
Goodwill [Line Items]
Beginning balance	5,404
Goodwill impairment	(180)
Relative fair value allocation		5,404
Translation differences	28
Ending balance	$ 5,252	$ 5,404

Goodwill Fair Value Allocation

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 350
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-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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- Definition

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

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- Definition

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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