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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 4,904 | $ 6,246
Provisions related to sales made in current year period | 13,808 | 14,806
Provisions related to sales made in prior periods | (318) | (497)
Credits and payments | (14,036) | (15,707)
Translation differences | (49) | 56
Balance at end of period | 4,309 | 4,904
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 period | 382 | 391
Provisions related to sales made in prior periods | (9) | 0
Credits and payments | (385) | (398)
Translation differences | 0 | 0
Balance at end of period | 68 | 80
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 2,054 | 2,895
Provisions related to sales made in current year period | 4,030 | 4,703
Provisions related to sales made in prior periods | (125) | (219)
Credits and payments | (4,275) | (5,360)
Translation differences | (29) | 35
Balance at end of period | 1,655 | 2,054
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 period | 852 | 744
Provisions related to sales made in prior periods | (51) | (184)
Credits and payments | (768) | (849)
Translation differences | (7) | 8
Balance at end of period | 854 | 828
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,108 | 1,342
Provisions related to sales made in current year period | 7,967 | 8,438
Provisions related to sales made in prior periods | (47) | (65)
Credits and payments | (7,937) | (8,614)
Translation differences | (6) | 7
Balance at end of period | 1,085 | 1,108
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 686 | 637
Provisions related to sales made in current year period | 263 | 459
Provisions related to sales made in prior periods | (60) | (28)
Credits and payments | (350) | (386)
Translation differences | (4) | 4
Balance at end of period | 535 | 686
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 148 | 176
Provisions related to sales made in current year period | 314 | 71
Provisions related to sales made in prior periods | (26) | (1)
Credits and payments | (321) | (100)
Translation differences | (3) | 2
Balance at end of period | 112 | 148
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 period | 13,426 | 14,415
Provisions related to sales made in prior periods | (309) | (497)
Credits and payments | (13,651) | (15,309)
Translation differences | (49) | 56
Balance at end of period | $ 4,241 | $ 4,824

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