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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 6,886 | $ 8,077
Provisions related to sales made in current year period | 17,150 | 19,413
Provisions related to sales made in prior periods | (189) | (59)
Credits and payments | (17,605) | (20,480)
Translation differences | 4 | (65)
Balance at end of period | 6,246 | 6,886
Reserves Included in Accounts Receivable, Net [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 175 | 196
Provisions related to sales made in current year period | 383 | 514
Provisions related to sales made in prior periods |  | 3
Credits and payments | (471) | (538)
Balance at end of period | 87 | 175
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 3,006 | 3,077
Provisions related to sales made in current year period | 5,552 | 6,572
Provisions related to sales made in prior periods | (92) | (14)
Credits and payments | (5,570) | (6,596)
Translation differences | (1) | (33)
Balance at end of period | 2,895 | 3,006
Medicaid and Other Governmental Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,361 | 1,908
Provisions related to sales made in current year period | 976 | 1,284
Provisions related to sales made in prior periods | (151) | 24
Credits and payments | (1,076) | (1,850)
Translation differences | (1) | (5)
Balance at end of period | 1,109 | 1,361
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,530 | 1,849
Provisions related to sales made in current year period | 9,565 | 10,206
Provisions related to sales made in prior periods | (17) |
Credits and payments | (9,736) | (10,519)
Translation differences | 1 | (6)
Balance at end of period | 1,342 | 1,530
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 638 | 780
Provisions related to sales made in current year period | 281 | 442
Provisions related to sales made in prior periods | 77 | 28
Credits and payments | (360) | (606)
Translation differences | 1 | (6)
Balance at end of period | 637 | 638
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 176 | 267
Provisions related to sales made in current year period | 394 | 417
Provisions related to sales made in prior periods | (6) | (30)
Credits and payments | (392) | (463)
Translation differences | 4 | (15)
Balance at end of period | 176 | 176
Total Reserves Included in Sales Reserves and Allowances [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 6,711 | 7,881
Provisions related to sales made in current year period | 16,767 | 18,899
Provisions related to sales made in prior periods | (189) | (62)
Credits and payments | (17,134) | (19,942)
Translation differences | 4 | (65)
Balance at end of period | $ 6,159 | $ 6,711

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