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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 4,309 | $ 4,904
Provisions related to sales made in current year | 3,170 | 3,532
Provisions related to sales made in prior periods | (87) | (117)
Credits and payments | (3,518) | (3,628)
Translation differences | (5) | (29)
Balance at end of period | 3,869 | 4,662
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 | 82 | 100
Credits and payments | (88) | (102)
Balance at end of period | 62 | 78
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,655 | 2,054
Provisions related to sales made in current year | 928 | 1,126
Provisions related to sales made in prior periods | (90) | (55)
Credits and payments | (1,037) | (1,210)
Translation differences | (3) | (17)
Balance at end of period | 1,453 | 1,898
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 | 198 | 164
Provisions related to sales made in prior periods | 26 | (11)
Credits and payments | (270) | (188)
Translation differences | (1) | (4)
Balance at end of period | 807 | 789
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,085 | 1,108
Provisions related to sales made in current year | 1,814 | 2,043
Provisions related to sales made in prior periods | (8) | 6
Credits and payments | (1,940) | (1,987)
Translation differences |  | (3)
Balance at end of period | 951 | 1,167
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 535 | 686
Provisions related to sales made in current year | 58 | 76
Provisions related to sales made in prior periods | (14) | (40)
Credits and payments | (110) | (101)
Translation differences |  | (3)
Balance at end of period | 469 | 618
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 112 | 148
Provisions related to sales made in current year | 90 | 23
Provisions related to sales made in prior periods | (1) | (17)
Credits and payments | (73) | (40)
Translation differences | (1) | (2)
Balance at end of period | 127 | 112
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 | 3,088 | 3,432
Provisions related to sales made in prior periods | (87) | (117)
Credits and payments | (3,430) | (3,526)
Translation differences | (5) | (29)
Balance at end of period | $ 3,807 | $ 4,584

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