Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	$ 8,077
Provisions related to sales made in current year period	10,168
Provisions related to sales made in prior periods	(51)
Credits and payments	(10,850)
Translation differences	(34)
Sales reserves and allowances, ending balance	7,310
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	263
Provisions related to sales made in prior periods	2
Credits and payments	(288)
Translation differences	(1)
Sales reserves and allowances, ending balance	172
Rebates [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	3,077
Provisions related to sales made in current year period	3,496
Provisions related to sales made in prior periods	(28)
Credits and payments	(3,556)
Translation differences	(17)
Sales reserves and allowances, ending balance	2,972
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	701
Provisions related to sales made in prior periods	(21)
Credits and payments	(779)
Translation differences	(3)
Sales reserves and allowances, ending balance	1,806
Chargebacks [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	1,849
Provisions related to sales made in current year period	5,327
Provisions related to sales made in prior periods	(1)
Credits and payments	(5,765)
Translation differences	(2)
Sales reserves and allowances, ending balance	1,408
Returns [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	780
Provisions related to sales made in current year period	171
Provisions related to sales made in prior periods	17
Credits and payments	(211)
Translation differences	(3)
Sales reserves and allowances, ending balance	754
Other [Member]
Revenue Recognition [Line Items]
Sales reserves and allowances, beginning balance	267
Provisions related to sales made in current year period	210
Provisions related to sales made in prior periods	(20)
Credits and payments	(251)
Translation differences	(8)
Sales reserves and allowances, ending balance	198
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	9,905
Provisions related to sales made in prior periods	(53)
Credits and payments	(10,562)
Translation differences	(33)
Sales reserves and allowances, ending balance	$ 7,138

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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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