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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Revenue Recognition [Line Items]    
Balance at beginning of period $ 4,904 $ 6,246
Provisions related to sales made in current year 7,037 7,806
Provisions related to sales made in prior periods (196) (293)
Credits and payments (7,209) (8,466)
Translation differences (12) (18)
Balance at end of period 4,524 5,275
Reserves Included in Accounts Receivable, Net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 80 87
Provisions related to sales made in current year 192 193
Provisions related to sales made in prior periods (5)  
Credits and payments (196) (206)
Balance at end of period 71 74
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 2,054 2,895
Provisions related to sales made in current year 2,139 2,588
Provisions related to sales made in prior periods (82) (191)
Credits and payments (2,355) (3,064)
Translation differences (8) (9)
Balance at end of period 1,748 2,219
Medicaid and Other Governmental Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 828 1,109
Provisions related to sales made in current year 391 434
Provisions related to sales made in prior periods (35) (105)
Credits and payments (362) (505)
Translation differences (3)  
Balance at end of period 819 933
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,108 1,342
Provisions related to sales made in current year 3,995 4,325
Provisions related to sales made in prior periods (11) (15)
Credits and payments (3,934) (4,416)
Translation differences (1) (2)
Balance at end of period 1,157 1,234
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 686 637
Provisions related to sales made in current year 143 216
Provisions related to sales made in prior periods (40) 18
Credits and payments (186) (211)
Translation differences (1) (2)
Balance at end of period 602 658
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 148 176
Provisions related to sales made in current year 177 50
Provisions related to sales made in prior periods (23)  
Credits and payments (176) (64)
Translation differences 1 (5)
Balance at end of period 127 157
Total Reserves Included in Sales Reserves and Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 4,824 6,159
Provisions related to sales made in current year 6,845 7,613
Provisions related to sales made in prior periods (191) (293)
Credits and payments (7,013) (8,260)
Translation differences (12) (18)
Balance at end of period $ 4,453 $ 5,201