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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 6,246 | $ 6,886
Provisions related to sales made in current year | 11,122 | 12,797
Provisions related to sales made in prior periods | (350) | (12)
Credits and payments | (11,958) | (13,359)
Translation differences | 12 | (19)
Balance at end of period | 5,072 | 6,293
Reserves Included in Accounts Receivable, Net [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 87 | 175
Provisions related to sales made in current year | 285 | 334
Provisions related to sales made in prior periods |  | 3
Credits and payments | (298) | (356)
Balance at end of period | 74 | 156
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 2,895 | 3,006
Provisions related to sales made in current year | 3,649 | 4,004
Provisions related to sales made in prior periods | (192) | (28)
Credits and payments | (4,224) | (4,276)
Translation differences | 10 | (14)
Balance at end of period | 2,138 | 2,692
Medicaid and Other Governmental Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,109 | 1,361
Provisions related to sales made in current year | 566 | 760
Provisions related to sales made in prior periods | (116) | (2)
Credits and payments | (650) | (882)
Translation differences | 4 | (4)
Balance at end of period | 913 | 1,233
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,342 | 1,530
Provisions related to sales made in current year | 6,268 | 7,196
Provisions related to sales made in prior periods | (33) | (1)
Credits and payments | (6,418) | (7,299)
Translation differences | 2 | (1)
Balance at end of period | 1,161 | 1,425
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 637 | 638
Provisions related to sales made in current year | 299 | 195
Provisions related to sales made in prior periods | (11) | 23
Credits and payments | (289) | (251)
Translation differences |  | (1)
Balance at end of period | 636 | 604
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 176 | 176
Provisions related to sales made in current year | 55 | 308
Provisions related to sales made in prior periods | 2 | (7)
Credits and payments | (79) | (295)
Translation differences | (4) | 1
Balance at end of period | 150 | 183
Total Reserves Included in Sales Reserves and Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 6,159 | 6,711
Provisions related to sales made in current year | 10,837 | 12,463
Provisions related to sales made in prior periods | (350) | (15)
Credits and payments | (11,660) | (13,003)
Translation differences | 12 | (19)
Balance at end of period | $ 4,998 | $ 6,137

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