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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Revenue Recognition [Line Items]    
Balance at beginning of period $ 4,309 $ 4,904
Provisions related to sales made in current year 9,886 10,364
Provisions related to sales made in prior periods (158) (254)
Credits and payments (10,231) (10,669)
Translation differences (106) (37)
Balance at end of period 3,700 4,308
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 269 285
Provisions related to sales made in prior periods   (5)
Credits and payments (285) (293)
Balance at end of period 52 67
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,655 2,054
Provisions related to sales made in current year 2,832 3,060
Provisions related to sales made in prior periods (103) (94)
Credits and payments (2,845) (3,286)
Translation differences (66) (22)
Balance at end of period 1,473 1,712
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 684 617
Provisions related to sales made in prior periods (15) (46)
Credits and payments (762) (595)
Translation differences (11) (5)
Balance at end of period 750 799
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,085 1,108
Provisions related to sales made in current year 5,656 5,949
Provisions related to sales made in prior periods (28) (31)
Credits and payments (5,826) (5,983)
Translation differences (17) (4)
Balance at end of period 870 1,039
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 535 686
Provisions related to sales made in current year 219 207
Provisions related to sales made in prior periods (9) (53)
Credits and payments (300) (265)
Translation differences (8) (4)
Balance at end of period 437 571
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 112 148
Provisions related to sales made in current year 226 246
Provisions related to sales made in prior periods (3) (25)
Credits and payments (213) (247)
Translation differences (4) (2)
Balance at end of period 118 120
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 9,617 10,079
Provisions related to sales made in prior periods (158) (249)
Credits and payments (9,946) (10,376)
Translation differences (106) (37)
Balance at end of period $ 3,648 $ 4,241