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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenue Recognition [Line Items]    
Balance at beginning of period $ 3,817 $ 4,309
Provisions related to sales made in current year period 3,178 3,170
Provisions related to sales made in prior periods (47) (87)
Credits and payments (3,589) (3,518)
Translation differences 13 (5)
Balance at end of period 3,372 3,869
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 80 82
Provisions related to sales made in prior periods   0
Credits and payments (84) (88)
Translation differences   0
Balance at end of period 63 62
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,575 1,655
Provisions related to sales made in current year period 1,003 928
Provisions related to sales made in prior periods (7) (90)
Credits and payments (1,127) (1,037)
Translation differences 8 (3)
Balance at end of period 1,452 1,453
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 142 198
Provisions related to sales made in prior periods (36) 26
Credits and payments (289) (270)
Translation differences 2 (1)
Balance at end of period 482 807
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 991 1,085
Provisions related to sales made in current year period 1,855 1,814
Provisions related to sales made in prior periods (9) (8)
Credits and payments (1,973) (1,940)
Translation differences 2 0
Balance at end of period 866 951
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 455 535
Provisions related to sales made in current year period 73 58
Provisions related to sales made in prior periods 6 (14)
Credits and payments (95) (110)
Translation differences 1 0
Balance at end of period 440 469
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 66 112
Provisions related to sales made in current year period 25 90
Provisions related to sales made in prior periods (1) (1)
Credits and payments (21) (73)
Translation differences   (1)
Balance at end of period 69 127
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 3,098 3,088
Provisions related to sales made in prior periods (47) (87)
Credits and payments (3,505) (3,430)
Translation differences 13 (5)
Balance at end of period $ 3,309 $ 3,807