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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Revenue Recognition [Line Items] |
Balance at beginning of period | $ 8,077
Provisions related to sales made in current year period | 19,413
Provisions related to sales made in prior periods | (59)
Credits and payments | (20,480)
Translation differences | (65)
Balance at end of period | 6,886
Reserves Included in Accounts Receivable, Net [Member] |
Revenue Recognition [Line Items] |
Balance at beginning of period | 196
Provisions related to sales made in current year period | 514
Provisions related to sales made in prior periods | 3
Credits and payments | (538)
Balance at end of period | 175
Rebates [Member] |
Revenue Recognition [Line Items] |
Balance at beginning of period | 3,077
Provisions related to sales made in current year period | 6,572
Provisions related to sales made in prior periods | (14)
Credits and payments | (6,596)
Translation differences | (33)
Balance at end of period | 3,006
Medicaid and Other Governmental Allowances [Member] |
Revenue Recognition [Line Items] |
Balance at beginning of period | 1,908
Provisions related to sales made in current year period | 1,284
Provisions related to sales made in prior periods | 24
Credits and payments | (1,850)
Translation differences | (5)
Balance at end of period | 1,361
Chargebacks [Member] |
Revenue Recognition [Line Items] |
Balance at beginning of period | 1,849
Provisions related to sales made in current year period | 10,206
Credits and payments | (10,519)
Translation differences | (6)
Balance at end of period | 1,530
Returns [Member] |
Revenue Recognition [Line Items] |
Balance at beginning of period | 780
Provisions related to sales made in current year period | 442
Provisions related to sales made in prior periods | 28
Credits and payments | (606)
Translation differences | (6)
Balance at end of period | 638
Other [Member] |
Revenue Recognition [Line Items] |
Balance at beginning of period | 267
Provisions related to sales made in current year period | 417
Provisions related to sales made in prior periods | (30)
Credits and payments | (463)
Translation differences | (15)
Balance at end of period | 176
Total Reserves Included in Sales Reserves and Allowances [Member] |
Revenue Recognition [Line Items] |
Balance at beginning of period | 7,881
Provisions related to sales made in current year period | 18,899
Provisions related to sales made in prior periods | (62)
Credits and payments | (19,942)
Translation differences | (65)
Balance at end of period | $ 6,711

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