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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 4,904 | $ 6,246
Provisions related to sales made in current year | 7,037 | 7,806
Provisions related to sales made in prior periods | (196) | (293)
Credits and payments | (7,209) | (8,466)
Translation differences | (12) | (18)
Balance at end of period | 4,524 | 5,275
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 | 192 | 193
Provisions related to sales made in prior periods | (5) |
Credits and payments | (196) | (206)
Balance at end of period | 71 | 74
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 2,054 | 2,895
Provisions related to sales made in current year | 2,139 | 2,588
Provisions related to sales made in prior periods | (82) | (191)
Credits and payments | (2,355) | (3,064)
Translation differences | (8) | (9)
Balance at end of period | 1,748 | 2,219
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 | 391 | 434
Provisions related to sales made in prior periods | (35) | (105)
Credits and payments | (362) | (505)
Translation differences | (3) |
Balance at end of period | 819 | 933
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,108 | 1,342
Provisions related to sales made in current year | 3,995 | 4,325
Provisions related to sales made in prior periods | (11) | (15)
Credits and payments | (3,934) | (4,416)
Translation differences | (1) | (2)
Balance at end of period | 1,157 | 1,234
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 686 | 637
Provisions related to sales made in current year | 143 | 216
Provisions related to sales made in prior periods | (40) | 18
Credits and payments | (186) | (211)
Translation differences | (1) | (2)
Balance at end of period | 602 | 658
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 148 | 176
Provisions related to sales made in current year | 177 | 50
Provisions related to sales made in prior periods | (23) |
Credits and payments | (176) | (64)
Translation differences | 1 | (5)
Balance at end of period | 127 | 157
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 | 6,845 | 7,613
Provisions related to sales made in prior periods | (191) | (293)
Credits and payments | (7,013) | (8,260)
Translation differences | (12) | (18)
Balance at end of period | $ 4,453 | $ 5,201

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