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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