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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,596 $ 3,817
Provisions related to sales made in current year period 3,447 3,178
Provisions related to sales made in prior periods 12 (47)
Credits and payments (3,364) (3,589)
Translation differences (30) 13
Balance at end of period 3,661 3,372
Reserves Included in Accounts Receivable, net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 61 67
Provisions related to sales made in current year period 93 80
Provisions related to sales made in prior periods   0
Credits and payments (87) (84)
Translation differences   0
Balance at end of period 67 63
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,603 1,575
Provisions related to sales made in current year period 1,118 1,003
Provisions related to sales made in prior periods 10 (7)
Credits and payments (1,086) (1,127)
Translation differences (17) 8
Balance at end of period 1,628 1,452
Medicaid and other governmental allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 540 663
Provisions related to sales made in current year period 181 142
Provisions related to sales made in prior periods 20 (36)
Credits and payments (171) (289)
Translation differences (3) 2
Balance at end of period 567 482
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 859 991
Provisions related to sales made in current year period 1,942 1,855
Provisions related to sales made in prior periods (11) (9)
Credits and payments (1,935) (1,973)
Translation differences (5) 2
Balance at end of period 850 866
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 436 455
Provisions related to sales made in current year period 73 73
Provisions related to sales made in prior periods (6) 6
Credits and payments (67) (95)
Translation differences (3) 1
Balance at end of period 433 440
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 97 66
Provisions related to sales made in current year period 40 25
Provisions related to sales made in prior periods (1) (1)
Credits and payments (18) (21)
Translation differences (2)  
Balance at end of period 116 69
Total reserves included in sales reserves and allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 3,535 3,750
Provisions related to sales made in current year period 3,354 3,098
Provisions related to sales made in prior periods 12 (47)
Credits and payments (3,277) (3,505)
Translation differences (30) 13
Balance at end of period $ 3,594 $ 3,309