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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenue Recognition [Line Items] |  |
Balance at beginning of period | $ 6,246 | $ 6,886
Provisions related to sales made in current year period | 4,100 | 4,292
Provisions related to sales made in prior periods | (148) | (2)
Credits and payments | (4,410) | (4,807)
Translation differences | (43) | (7)
Balance at end of period | 5,745 | 6,362
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 period | 102 | 112
Credits and payments | (106) | (125)
Balance at end of period | 83 | 162
Rebates [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 2,895 | 3,006
Provisions related to sales made in current year period | 1,370 | 1,350
Provisions related to sales made in prior periods | (106) |
Credits and payments | (1,513) | (1,613)
Translation differences | (21) | (6)
Balance at end of period | 2,625 | 2,737
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 period | 233 | 324
Provisions related to sales made in prior periods | (29) | 1
Credits and payments | (248) | (438)
Translation differences | (2) | (1)
Balance at end of period | 1,063 | 1,247
Chargebacks [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 1,342 | 1,530
Provisions related to sales made in current year period | 2,223 | 2,320
Provisions related to sales made in prior periods | (16) | (5)
Credits and payments | (2,396) | (2,413)
Translation differences | (6) |
Balance at end of period | 1,147 | 1,432
Returns [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 637 | 638
Provisions related to sales made in current year period | 139 | 72
Provisions related to sales made in prior periods | (1) | 3
Credits and payments | (112) | (117)
Translation differences | (4) |
Balance at end of period | 659 | 596
Other [Member] |  |
Revenue Recognition [Line Items] |  |
Balance at beginning of period | 176 | 176
Provisions related to sales made in current year period | 33 | 114
Provisions related to sales made in prior periods | 4 | (1)
Credits and payments | (35) | (101)
Translation differences | (10) |
Balance at end of period | 168 | 188
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 period | 3,998 | 4,180
Provisions related to sales made in prior periods | (148) | (2)
Credits and payments | (4,304) | (4,682)
Translation differences | (43) | (7)
Balance at end of period | $ 5,662 | $ 6,200

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