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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,596 $ 3,817
Provisions related to sales made in current year period 7,084 6,516
Provisions related to sales made in prior periods 9 (47)
Credits and payments (6,884) (6,804)
Translation differences (35) 15
Balance at end of period 3,770 3,497
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 194 175
Provisions related to sales made in prior periods 0 0
Credits and payments (184) (178)
Translation differences 0 0
Balance at end of period 70 64
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,603 1,575
Provisions related to sales made in current year period 2,325 2,037
Provisions related to sales made in prior periods 12 (17)
Credits and payments (2,183) (2,068)
Translation differences (19) 11
Balance at end of period 1,738 1,538
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 382 319
Provisions related to sales made in prior periods 26 (26)
Credits and payments (376) (431)
Translation differences (4) 2
Balance at end of period 568 527
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 859 991
Provisions related to sales made in current year period 3,950 3,788
Provisions related to sales made in prior periods (11) (17)
Credits and payments (3,923) (3,908)
Translation differences (6) 2
Balance at end of period 869 856
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 436 455
Provisions related to sales made in current year period 146 141
Provisions related to sales made in prior periods (17) 16
Credits and payments (129) (181)
Translation differences (4) 2
Balance at end of period 432 433
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 97 66
Provisions related to sales made in current year period 81 56
Provisions related to sales made in prior periods (1) (3)
Credits and payments (82) (38)
Translation differences (2) (2)
Balance at end of period 93 79
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 6,896 6,341
Provisions related to sales made in prior periods 9 (47)
Credits and payments (6,705) (6,626)
Translation differences (35) 15
Balance at end of period $ 3,700 $ 3,433