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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,734 $ 3,596
Provisions related to sales made in current year period 3,655 3,447
Provisions related to sales made in prior periods (55) 12
Credits and payments (3,606) (3,364)
Translation differences 40 (30)
Balance at end of period 3,768 3,661
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 99 93
Credits and payments (83) (87)
Balance at end of period 72 67
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,674 1,603
Provisions related to sales made in current year period 1,250 1,118
Provisions related to sales made in prior periods (37) 10
Credits and payments (1,224) (1,086)
Translation differences 19 (17)
Balance at end of period 1,682 1,628
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 219 181
Provisions related to sales made in prior periods 9 20
Credits and payments (193) (171)
Translation differences 5 (3)
Balance at end of period 601 567
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 936 859
Provisions related to sales made in current year period 1,988 1,942
Provisions related to sales made in prior periods (20) (11)
Credits and payments (2,035) (1,935)
Translation differences 6 (5)
Balance at end of period 875 850
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 399 436
Provisions related to sales made in current year period 69 73
Provisions related to sales made in prior periods (3) (6)
Credits and payments (55) (67)
Translation differences 2 (3)
Balance at end of period 412 433
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 108 97
Provisions related to sales made in current year period 30 40
Provisions related to sales made in prior periods (4) (1)
Credits and payments (16) (18)
Translation differences 8 (2)
Balance at end of period 126 116
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 3,556 3,354
Provisions related to sales made in prior periods (55) 12
Credits and payments (3,523) (3,277)
Translation differences 40 (30)
Balance at end of period $ 3,696 $ 3,594