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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Revenue Recognition [Line Items]    
Balance at beginning of period $ 4,309 $ 4,904
Provisions related to sales made in current year 6,651 7,037
Provisions related to sales made in prior periods (108) (196)
Credits and payments (6,861) (7,209)
Translation differences (47) (12)
Balance at end of period 3,944 4,524
Reserves Included in Accounts Receivable, Net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 68 80
Provisions related to sales made in current year 181 192
Provisions related to sales made in prior periods   (5)
Credits and payments (185) (196)
Balance at end of period 64 71
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,655 2,054
Provisions related to sales made in current year 1,889 2,139
Provisions related to sales made in prior periods (102) (82)
Credits and payments (1,901) (2,355)
Translation differences (33) (8)
Balance at end of period 1,508 1,748
Medicaid and Other Governmental Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 854 828
Provisions related to sales made in current year 446 391
Provisions related to sales made in prior periods 20 (35)
Credits and payments (497) (362)
Translation differences (6) (3)
Balance at end of period 817 819
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,085 1,108
Provisions related to sales made in current year 3,836 3,995
Provisions related to sales made in prior periods (8) (11)
Credits and payments (3,922) (3,934)
Translation differences (7) (1)
Balance at end of period 984 1,157
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 535 686
Provisions related to sales made in current year 147 143
Provisions related to sales made in prior periods (16) (40)
Credits and payments (211) (186)
Translation differences (4) (1)
Balance at end of period 451 602
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 112 148
Provisions related to sales made in current year 152 177
Provisions related to sales made in prior periods (2) (23)
Credits and payments (145) (176)
Translation differences 3 1
Balance at end of period 120 127
Total Reserves Included in Sales Reserves and Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 4,241 4,824
Provisions related to sales made in current year 6,470 6,845
Provisions related to sales made in prior periods (108) (191)
Credits and payments (6,676) (7,013)
Translation differences (47) (12)
Balance at end of period $ 3,880 $ 4,453