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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 6,246 | $ 6,886
Provisions related to sales made in current year period | 14,806 | 17,150
Provisions related to sales made in prior periods | (497) | (189)
Credits and payments | (15,707) | (17,605)
Translation differences | 56 | 4
Balance at end of period | 4,904 | 6,246
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 | 391 | 383
Credits and payments | (398) | (471)
Balance at end of period | 80 | 87
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 2,895 | 3,006
Provisions related to sales made in current year period | 4,703 | 5,552
Provisions related to sales made in prior periods | (219) | (92)
Credits and payments | (5,360) | (5,570)
Translation differences | 35 | (1)
Balance at end of period | 2,054 | 2,895
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 | 744 | 976
Provisions related to sales made in prior periods | (184) | (151)
Credits and payments | (849) | (1,076)
Translation differences | 8 | (1)
Balance at end of period | 828 | 1,109
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,342 | 1,530
Provisions related to sales made in current year period | 8,438 | 9,565
Provisions related to sales made in prior periods | (65) | (17)
Credits and payments | (8,614) | (9,736)
Translation differences | 7 | 1
Balance at end of period | 1,108 | 1,342
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 637 | 638
Provisions related to sales made in current year period | 459 | 281
Provisions related to sales made in prior periods | (28) | 77
Credits and payments | (386) | (360)
Translation differences | 4 | 1
Balance at end of period | 686 | 637
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 176 | 176
Provisions related to sales made in current year period | 71 | 394
Provisions related to sales made in prior periods | (1) | (6)
Credits and payments | (100) | (392)
Translation differences | 2 | 4
Balance at end of period | 148 | 176
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 | 14,415 | 16,767
Provisions related to sales made in prior periods | (497) | (189)
Credits and payments | (15,309) | (17,134)
Translation differences | 56 | 4
Balance at end of period | $ 4,824 | $ 6,159

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