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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue Recognition [Line Items]    
Balance at beginning of period $ 4,309 $ 4,904
Provisions related to sales made in current year 3,170 3,532
Provisions related to sales made in prior periods (87) (117)
Credits and payments (3,518) (3,628)
Translation differences (5) (29)
Balance at end of period 3,869 4,662
Reserves Included in Accounts Receivable, Net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 68 80
Provisions related to sales made in current year 82 100
Credits and payments (88) (102)
Balance at end of period 62 78
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,655 2,054
Provisions related to sales made in current year 928 1,126
Provisions related to sales made in prior periods (90) (55)
Credits and payments (1,037) (1,210)
Translation differences (3) (17)
Balance at end of period 1,453 1,898
Medicaid and Other Governmental Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 854 828
Provisions related to sales made in current year 198 164
Provisions related to sales made in prior periods 26 (11)
Credits and payments (270) (188)
Translation differences (1) (4)
Balance at end of period 807 789
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,085 1,108
Provisions related to sales made in current year 1,814 2,043
Provisions related to sales made in prior periods (8) 6
Credits and payments (1,940) (1,987)
Translation differences   (3)
Balance at end of period 951 1,167
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 535 686
Provisions related to sales made in current year 58 76
Provisions related to sales made in prior periods (14) (40)
Credits and payments (110) (101)
Translation differences   (3)
Balance at end of period 469 618
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 112 148
Provisions related to sales made in current year 90 23
Provisions related to sales made in prior periods (1) (17)
Credits and payments (73) (40)
Translation differences (1) (2)
Balance at end of period 127 112
Total Reserves Included in Sales Reserves and Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 4,241 4,824
Provisions related to sales made in current year 3,088 3,432
Provisions related to sales made in prior periods (87) (117)
Credits and payments (3,430) (3,526)
Translation differences (5) (29)
Balance at end of period $ 3,807 $ 4,584