Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Revenue Recognition [Line Items]
Balance at beginning of period	$ 6,886
Provisions related to sales made in current year period	4,292
Provisions related to sales made in prior periods	(2)
Credits and payments	(4,807)
Translation differences	(7)
Balance at end of period	6,362
Reserves Included in Accounts Receivable, Net [Member]
Revenue Recognition [Line Items]
Balance at beginning of period	175
Provisions related to sales made in current year period	112
Credits and payments	(125)
Balance at end of period	162
Rebates [Member]
Revenue Recognition [Line Items]
Balance at beginning of period	3,006
Provisions related to sales made in current year period	1,350
Credits and payments	(1,613)
Translation differences	(6)
Balance at end of period	2,737
Medicaid and Other Governmental Allowances [Member]
Revenue Recognition [Line Items]
Balance at beginning of period	1,361
Provisions related to sales made in current year period	324
Provisions related to sales made in prior periods	1
Credits and payments	(438)
Translation differences	(1)
Balance at end of period	1,247
Chargebacks [Member]
Revenue Recognition [Line Items]
Balance at beginning of period	1,530
Provisions related to sales made in current year period	2,320
Provisions related to sales made in prior periods	(5)
Credits and payments	(2,413)
Balance at end of period	1,432
Returns [Member]
Revenue Recognition [Line Items]
Balance at beginning of period	638
Provisions related to sales made in current year period	72
Provisions related to sales made in prior periods	3
Credits and payments	(117)
Balance at end of period	596
Other [Member]
Revenue Recognition [Line Items]
Balance at beginning of period	176
Provisions related to sales made in current year period	114
Provisions related to sales made in prior periods	(1)
Credits and payments	(101)
Balance at end of period	188
Total Reserves Included in Sales Reserves and Allowances [Member]
Revenue Recognition [Line Items]
Balance at beginning of period	6,711
Provisions related to sales made in current year period	4,180
Provisions related to sales made in prior periods	(2)
Credits and payments	(4,682)
Translation differences	(7)
Balance at end of period	$ 6,200

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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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