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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 6,246 | $ 6,886
Provisions related to sales made in current year period | 7,806 | 8,611
Provisions related to sales made in prior periods | (293) | 1
Credits and payments | (8,466) | (9,294)
Translation differences | (18) | 12
Balance at end of period | 5,275 | 6,216
Reserves Included in Accounts Receivable, Net [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 87 | 175
Provisions related to sales made in current year period | 193 | 229
Provisions related to sales made in prior periods | 0 | 0
Credits and payments | (206) | (242)
Translation differences | 0 | 0
Balance at end of period | 74 | 162
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 2,895 | 3,006
Provisions related to sales made in current year period | 2,588 | 2,651
Provisions related to sales made in prior periods | (191) | 7
Credits and payments | (3,064) | (2,975)
Translation differences | (9) | 4
Balance at end of period | 2,219 | 2,693
Medicaid and Other Governmental Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,109 | 1,361
Provisions related to sales made in current year period | 434 | 548
Provisions related to sales made in prior periods | (105) | 0
Credits and payments | (505) | (739)
Translation differences | 0 | 0
Balance at end of period | 933 | 1,170
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,342 | 1,530
Provisions related to sales made in current year period | 4,325 | 4,822
Provisions related to sales made in prior periods | (15) | (5)
Credits and payments | (4,416) | (4,936)
Translation differences | (2) | 2
Balance at end of period | 1,234 | 1,413
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 637 | 638
Provisions related to sales made in current year period | 216 | 148
Provisions related to sales made in prior periods | 18 | 3
Credits and payments | (211) | (196)
Translation differences | (2) | 2
Balance at end of period | 658 | 595
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 176 | 176
Provisions related to sales made in current year period | 50 | 213
Provisions related to sales made in prior periods | 0 | (4)
Credits and payments | (64) | (206)
Translation differences | (5) | 4
Balance at end of period | 157 | 183
Total Reserves Included in Sales Reserves and Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 6,159 | 6,711
Provisions related to sales made in current year period | 7,613 | 8,382
Provisions related to sales made in prior periods | (293) | 1
Credits and payments | (8,260) | (9,052)
Translation differences | (18) | 12
Balance at end of period | $ 5,201 | $ 6,054

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