v3.26.1
Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,734 $ 3,596
Provisions related to sales made in current year period 15,009 14,194
Provisions related to sales made in prior periods (58) (9)
Credits and payments (14,603) (13,970)
Translation differences 124 (77)
Balance at end of period 4,206 3,734
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 412 390
Provisions related to sales made in prior periods 0 0
Credits and payments (405) (395)
Translation differences 0 0
Balance at end of period 63 56
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,674 1,603
Provisions related to sales made in current year period 5,129 4,640
Provisions related to sales made in prior periods (46) 5
Credits and payments (4,869) (4,531)
Translation differences 66 (43)
Balance at end of period 1,954 1,674
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 1,050 787
Provisions related to sales made in prior periods 44 22
Credits and payments (970) (781)
Translation differences 16 (7)
Balance at end of period 701 561
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 936 859
Provisions related to sales made in current year period 8,005 7,952
Provisions related to sales made in prior periods (29) (11)
Credits and payments (7,995) (7,851)
Translation differences 20 (13)
Balance at end of period 937 936
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 399 436
Provisions related to sales made in current year period 289 276
Provisions related to sales made in prior periods (15) (22)
Credits and payments (233) (286)
Translation differences 5 (5)
Balance at end of period 445 399
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 108 97
Provisions related to sales made in current year period 124 149
Provisions related to sales made in prior periods (12) (3)
Credits and payments (131) (126)
Translation differences 17 (9)
Balance at end of period 106 108
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 14,597 13,804
Provisions related to sales made in prior periods (58) (9)
Credits and payments (14,198) (13,575)
Translation differences 124 (77)
Balance at end of period $ 4,143 $ 3,678