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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,596 $ 3,817
Provisions related to sales made in current year period 10,571 9,612
Provisions related to sales made in prior periods 1 (52)
Credits and payments (10,324) (9,946)
Translation differences 4 (19)
Balance at end of period 3,848 3,412
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 294 262
Provisions related to sales made in prior periods 0 0
Credits and payments (292) (268)
Translation differences 0 0
Balance at end of period 63 61
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,603 1,575
Provisions related to sales made in current year period 3,436 2,968
Provisions related to sales made in prior periods 16 (22)
Credits and payments (3,269) (2,989)
Translation differences 1 (8)
Balance at end of period 1,787 1,524
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 579 468
Provisions related to sales made in prior periods 26 (33)
Credits and payments (556) (617)
Translation differences 3 (2)
Balance at end of period 592 479
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 859 991
Provisions related to sales made in current year period 5,925 5,636
Provisions related to sales made in prior periods (11) (21)
Credits and payments (5,877) (5,768)
Translation differences 1 (3)
Balance at end of period 897 835
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 436 455
Provisions related to sales made in current year period 191 205
Provisions related to sales made in prior periods (28) 24
Credits and payments (209) (251)
Translation differences (1) 0
Balance at end of period 389 433
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 97 66
Provisions related to sales made in current year period 146 73
Provisions related to sales made in prior periods (2) 0
Credits and payments (121) (53)
Translation differences 0 (6)
Balance at end of period 120 80
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 10,277 9,350
Provisions related to sales made in prior periods 1 (52)
Credits and payments (10,032) (9,678)
Translation differences 4 (19)
Balance at end of period $ 3,785 $ 3,351