Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	$ 8,077
Provisions related to sales made in current year period	14,546
Provisions related to sales made in prior periods	(10)
Credits and payments	(15,703)
Translation differences	(38)
Sales reserves and allowances, ending balance	6,872
Reserves Included in Accounts Receivable, Net [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	196
Provisions related to sales made in current year period	380
Provisions related to sales made in prior periods	7
Credits and payments	(412)
Sales reserves and allowances, ending balance	171
Rebates [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	3,077
Provisions related to sales made in current year period	4,956
Provisions related to sales made in prior periods	(39)
Credits and payments	(5,082)
Translation differences	(20)
Sales reserves and allowances, ending balance	2,892
Medicaid and Other Governmental Allowances [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	1,908
Provisions related to sales made in current year period	931
Provisions related to sales made in prior periods	17
Credits and payments	(1,288)
Translation differences	(4)
Sales reserves and allowances, ending balance	1,564
Chargebacks [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	1,849
Provisions related to sales made in current year period	7,738
Provisions related to sales made in prior periods	3
Credits and payments	(8,203)
Translation differences	(3)
Sales reserves and allowances, ending balance	1,384
Returns [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	780
Provisions related to sales made in current year period	232
Provisions related to sales made in prior periods	21
Credits and payments	(364)
Translation differences	(4)
Sales reserves and allowances, ending balance	665
Other [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	267
Provisions related to sales made in current year period	309
Provisions related to sales made in prior periods	(19)
Credits and payments	(354)
Translation differences	(7)
Sales reserves and allowances, ending balance	196
Total Reserves Included in Sales Reserves and Allowances [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	7,881
Provisions related to sales made in current year period	14,166
Provisions related to sales made in prior periods	(17)
Credits and payments	(15,291)
Translation differences	(38)
Sales reserves and allowances, ending balance	$ 6,701

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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