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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Revenue Recognition [Line Items]    
Balance at beginning of period $ 4,904 $ 6,246
Provisions related to sales made in current year 10,364 11,122
Provisions related to sales made in prior periods (254) (350)
Credits and payments (10,669) (11,958)
Translation differences (37) 12
Balance at end of period 4,308 5,072
Reserves Included in Accounts Receivable, Net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 80 87
Provisions related to sales made in current year 285 285
Provisions related to sales made in prior periods (5)  
Credits and payments (293) (298)
Translation differences 0  
Balance at end of period 67 74
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 2,054 2,895
Provisions related to sales made in current year 3,060 3,649
Provisions related to sales made in prior periods (94) (192)
Credits and payments (3,286) (4,224)
Translation differences (22) 10
Balance at end of period 1,712 2,138
Medicaid and Other Governmental Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 828 1,109
Provisions related to sales made in current year 617 566
Provisions related to sales made in prior periods (46) (116)
Credits and payments (595) (650)
Translation differences (5) 4
Balance at end of period 799 913
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,108 1,342
Provisions related to sales made in current year 5,949 6,268
Provisions related to sales made in prior periods (31) (33)
Credits and payments (5,983) (6,418)
Translation differences (4) 2
Balance at end of period 1,039 1,161
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 686 637
Provisions related to sales made in current year 207 299
Provisions related to sales made in prior periods (53) (11)
Credits and payments (265) (289)
Translation differences (4) 0
Balance at end of period 571 636
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 148 176
Provisions related to sales made in current year 246 55
Provisions related to sales made in prior periods (25) 2
Credits and payments (247) (79)
Translation differences (2) (4)
Balance at end of period 120 150
Total Reserves Included in Sales Reserves and Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 4,824 6,159
Provisions related to sales made in current year 10,079 10,837
Provisions related to sales made in prior periods (249) (350)
Credits and payments (10,376) (11,660)
Translation differences (37) 12
Balance at end of period $ 4,241 $ 4,998