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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
Revenue Recognition [Line Items]  
Balance at beginning of period $ 6,886
Provisions related to sales made in current year period 12,797
Provisions related to sales made in prior periods (12)
Credits and payments (13,359)
Translation differences (19)
Balance at end of period 6,293
Reserves Included in Accounts Receivable, Net [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 175
Provisions related to sales made in current year period 334
Provisions related to sales made in prior periods 3
Credits and payments (356)
Balance at end of period 156
Rebates [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 3,006
Provisions related to sales made in current year period 4,004
Provisions related to sales made in prior periods (28)
Credits and payments (4,276)
Translation differences (14)
Balance at end of period 2,692
Medicaid and Other Governmental Allowances [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 1,361
Provisions related to sales made in current year period 760
Provisions related to sales made in prior periods (2)
Credits and payments (882)
Translation differences (4)
Balance at end of period 1,233
Chargebacks [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 1,530
Provisions related to sales made in current year period 7,196
Provisions related to sales made in prior periods (1)
Credits and payments (7,299)
Translation differences (1)
Balance at end of period 1,425
Returns [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 638
Provisions related to sales made in current year period 195
Provisions related to sales made in prior periods 23
Credits and payments (251)
Translation differences (1)
Balance at end of period 604
Other [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 176
Provisions related to sales made in current year period 308
Provisions related to sales made in prior periods (7)
Credits and payments (295)
Translation differences 1
Balance at end of period 183
Total Reserves Included in Sales Reserves and Allowances [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 6,711
Provisions related to sales made in current year period 12,463
Provisions related to sales made in prior periods (15)
Credits and payments (13,003)
Translation differences (19)
Balance at end of period $ 6,137