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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 4,904 | $ 6,246
Provisions related to sales made in current year | 10,364 | 11,122
Provisions related to sales made in prior periods | (254) | (350)
Credits and payments | (10,669) | (11,958)
Translation differences | (37) | 12
Balance at end of period | 4,308 | 5,072
Reserves Included in Accounts Receivable, Net [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 80 | 87
Provisions related to sales made in current year | 285 | 285
Provisions related to sales made in prior periods | (5) |
Credits and payments | (293) | (298)
Translation differences | 0 |
Balance at end of period | 67 | 74
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 2,054 | 2,895
Provisions related to sales made in current year | 3,060 | 3,649
Provisions related to sales made in prior periods | (94) | (192)
Credits and payments | (3,286) | (4,224)
Translation differences | (22) | 10
Balance at end of period | 1,712 | 2,138
Medicaid and Other Governmental Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 828 | 1,109
Provisions related to sales made in current year | 617 | 566
Provisions related to sales made in prior periods | (46) | (116)
Credits and payments | (595) | (650)
Translation differences | (5) | 4
Balance at end of period | 799 | 913
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,108 | 1,342
Provisions related to sales made in current year | 5,949 | 6,268
Provisions related to sales made in prior periods | (31) | (33)
Credits and payments | (5,983) | (6,418)
Translation differences | (4) | 2
Balance at end of period | 1,039 | 1,161
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 686 | 637
Provisions related to sales made in current year | 207 | 299
Provisions related to sales made in prior periods | (53) | (11)
Credits and payments | (265) | (289)
Translation differences | (4) | 0
Balance at end of period | 571 | 636
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 148 | 176
Provisions related to sales made in current year | 246 | 55
Provisions related to sales made in prior periods | (25) | 2
Credits and payments | (247) | (79)
Translation differences | (2) | (4)
Balance at end of period | 120 | 150
Total Reserves Included in Sales Reserves and Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 4,824 | 6,159
Provisions related to sales made in current year | 10,079 | 10,837
Provisions related to sales made in prior periods | (249) | (350)
Credits and payments | (10,376) | (11,660)
Translation differences | (37) | 12
Balance at end of period | $ 4,241 | $ 4,998

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