v3.26.1
Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Revenue Recognition [Line Items]    
Balance at beginning of period $ 4,206 $ 3,734
Provisions related to sales made in current year period 7,247 7,459
Provisions related to sales made in prior periods (128) (52)
Credits and payments (7,340) (7,147)
Translation differences (27) 121
Balance at end of period 3,958 4,115
Reserves Included in Accounts Receivable, net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 63 56
Provisions related to sales made in current year period 186 203
Provisions related to sales made in prior periods 0 0
Credits and payments (190) (194)
Translation differences 0 0
Balance at end of period 59 65
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,954 1,674
Provisions related to sales made in current year period 2,387 2,520
Provisions related to sales made in prior periods (47) (46)
Credits and payments (2,475) (2,363)
Translation differences (19) 64
Balance at end of period 1,800 1,849
Medicaid and other governmental allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 701 561
Provisions related to sales made in current year period 596 486
Provisions related to sales made in prior periods (54) 30
Credits and payments (566) (468)
Translation differences (2) 17
Balance at end of period 675 626
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 937 936
Provisions related to sales made in current year period 3,877 4,034
Provisions related to sales made in prior periods (10) (28)
Credits and payments (3,897) (3,962)
Translation differences (4) 18
Balance at end of period 903 998
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 445 399
Provisions related to sales made in current year period 130 143
Provisions related to sales made in prior periods (12) (1)
Credits and payments (153) (112)
Translation differences (1) 5
Balance at end of period 409 434
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 106 108
Provisions related to sales made in current year period 71 73
Provisions related to sales made in prior periods (5) (7)
Credits and payments (59) (48)
Translation differences (1) 17
Balance at end of period 112 143
Total reserves included in sales reserves and allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 4,143 3,678
Provisions related to sales made in current year period 7,061 7,256
Provisions related to sales made in prior periods (128) (52)
Credits and payments (7,150) (6,953)
Translation differences (27) 121
Balance at end of period $ 3,899 $ 4,050