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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 4,309 | $ 4,904
Provisions related to sales made in current year | 6,651 | 7,037
Provisions related to sales made in prior periods | (108) | (196)
Credits and payments | (6,861) | (7,209)
Translation differences | (47) | (12)
Balance at end of period | 3,944 | 4,524
Reserves Included in Accounts Receivable, Net [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 68 | 80
Provisions related to sales made in current year | 181 | 192
Provisions related to sales made in prior periods |  | (5)
Credits and payments | (185) | (196)
Balance at end of period | 64 | 71
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,655 | 2,054
Provisions related to sales made in current year | 1,889 | 2,139
Provisions related to sales made in prior periods | (102) | (82)
Credits and payments | (1,901) | (2,355)
Translation differences | (33) | (8)
Balance at end of period | 1,508 | 1,748
Medicaid and Other Governmental Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 854 | 828
Provisions related to sales made in current year | 446 | 391
Provisions related to sales made in prior periods | 20 | (35)
Credits and payments | (497) | (362)
Translation differences | (6) | (3)
Balance at end of period | 817 | 819
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,085 | 1,108
Provisions related to sales made in current year | 3,836 | 3,995
Provisions related to sales made in prior periods | (8) | (11)
Credits and payments | (3,922) | (3,934)
Translation differences | (7) | (1)
Balance at end of period | 984 | 1,157
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 535 | 686
Provisions related to sales made in current year | 147 | 143
Provisions related to sales made in prior periods | (16) | (40)
Credits and payments | (211) | (186)
Translation differences | (4) | (1)
Balance at end of period | 451 | 602
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 112 | 148
Provisions related to sales made in current year | 152 | 177
Provisions related to sales made in prior periods | (2) | (23)
Credits and payments | (145) | (176)
Translation differences | 3 | 1
Balance at end of period | 120 | 127
Total Reserves Included in Sales Reserves and Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 4,241 | 4,824
Provisions related to sales made in current year | 6,470 | 6,845
Provisions related to sales made in prior periods | (108) | (191)
Credits and payments | (6,676) | (7,013)
Translation differences | (47) | (12)
Balance at end of period | $ 3,880 | $ 4,453

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