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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,734 $ 3,596
Provisions related to sales made in current year period 11,154 10,571
Provisions related to sales made in prior periods (48) 1
Credits and payments (10,751) (10,324)
Translation differences 116 4
Balance at end of period 4,205 3,848
Reserves Included in Accounts Receivable, net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 56 61
Provisions related to sales made in current year period 310 294
Provisions related to sales made in prior periods 0  
Credits and payments (295) (292)
Balance at end of period 71 63
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,674 1,603
Provisions related to sales made in current year period 3,746 3,436
Provisions related to sales made in prior periods (38) 16
Credits and payments (3,432) (3,269)
Translation differences 61 1
Balance at end of period 2,011 1,787
Medicaid and other governmental allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 561 540
Provisions related to sales made in current year period 753 579
Provisions related to sales made in prior periods 33 26
Credits and payments (701) (556)
Translation differences 16 3
Balance at end of period 662 592
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 936 859
Provisions related to sales made in current year period 6,012 5,925
Provisions related to sales made in prior periods (29) (11)
Credits and payments (6,062) (5,877)
Translation differences 18 1
Balance at end of period 875 897
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 399 436
Provisions related to sales made in current year period 213 191
Provisions related to sales made in prior periods (3) (28)
Credits and payments (168) (209)
Translation differences 5 (1)
Balance at end of period 446 389
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 108 97
Provisions related to sales made in current year period 120 146
Provisions related to sales made in prior periods (11) (2)
Credits and payments (93) (121)
Translation differences 16 0
Balance at end of period 140 120
Total reserves included in sales reserves and allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 3,678 3,535
Provisions related to sales made in current year period 10,844 10,277
Provisions related to sales made in prior periods (48) 1
Credits and payments (10,456) (10,032)
Translation differences 116 4
Balance at end of period $ 4,134 $ 3,785