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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,817 $ 4,309
Provisions related to sales made in current year period 6,516 6,651
Provisions related to sales made in prior periods (47) (108)
Credits and payments (6,804) (6,861)
Translation differences 15 (47)
Balance at end of period 3,497 3,944
Reserves Included in Accounts Receivable, net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 67 68
Provisions related to sales made in current year period 175 181
Provisions related to sales made in prior periods 0 0
Credits and payments (178) (185)
Translation differences 0 0
Balance at end of period 64 64
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,575 1,655
Provisions related to sales made in current year period 2,037 1,889
Provisions related to sales made in prior periods (17) (102)
Credits and payments (2,068) (1,901)
Translation differences 11 (33)
Balance at end of period 1,538 1,508
Medicaid and other governmental allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 663 854
Provisions related to sales made in current year period 319 446
Provisions related to sales made in prior periods (26) 20
Credits and payments (431) (497)
Translation differences 2 (6)
Balance at end of period 527 817
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 991 1,085
Provisions related to sales made in current year period 3,788 3,836
Provisions related to sales made in prior periods (17) (8)
Credits and payments (3,908) (3,922)
Translation differences 2 (7)
Balance at end of period 856 984
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 455 535
Provisions related to sales made in current year period 141 147
Provisions related to sales made in prior periods 16 (16)
Credits and payments (181) (211)
Translation differences 2 (4)
Balance at end of period 433 451
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 66 112
Provisions related to sales made in current year period 56 152
Provisions related to sales made in prior periods (3) (2)
Credits and payments (38) (145)
Translation differences (2) 3
Balance at end of period 79 120
Total reserves included in sales reserves and allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 3,750 4,241
Provisions related to sales made in current year period 6,341 6,470
Provisions related to sales made in prior periods (47) (108)
Credits and payments (6,626) (6,676)
Translation differences 15 (47)
Balance at end of period $ 3,433 $ 3,880