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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Revenue Recognition [Line Items]    
Balance at beginning of period $ 6,246 $ 6,886
Provisions related to sales made in current year period 7,806 8,611
Provisions related to sales made in prior periods (293) 1
Credits and payments (8,466) (9,294)
Translation differences (18) 12
Balance at end of period 5,275 6,216
Reserves Included in Accounts Receivable, Net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 87 175
Provisions related to sales made in current year period 193 229
Provisions related to sales made in prior periods 0 0
Credits and payments (206) (242)
Translation differences 0 0
Balance at end of period 74 162
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 2,895 3,006
Provisions related to sales made in current year period 2,588 2,651
Provisions related to sales made in prior periods (191) 7
Credits and payments (3,064) (2,975)
Translation differences (9) 4
Balance at end of period 2,219 2,693
Medicaid and Other Governmental Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,109 1,361
Provisions related to sales made in current year period 434 548
Provisions related to sales made in prior periods (105) 0
Credits and payments (505) (739)
Translation differences 0 0
Balance at end of period 933 1,170
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,342 1,530
Provisions related to sales made in current year period 4,325 4,822
Provisions related to sales made in prior periods (15) (5)
Credits and payments (4,416) (4,936)
Translation differences (2) 2
Balance at end of period 1,234 1,413
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 637 638
Provisions related to sales made in current year period 216 148
Provisions related to sales made in prior periods 18 3
Credits and payments (211) (196)
Translation differences (2) 2
Balance at end of period 658 595
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 176 176
Provisions related to sales made in current year period 50 213
Provisions related to sales made in prior periods 0 (4)
Credits and payments (64) (206)
Translation differences (5) 4
Balance at end of period 157 183
Total Reserves Included in Sales Reserves and Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 6,159 6,711
Provisions related to sales made in current year period 7,613 8,382
Provisions related to sales made in prior periods (293) 1
Credits and payments (8,260) (9,052)
Translation differences (18) 12
Balance at end of period $ 5,201 $ 6,054