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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue Recognition [Line Items]    
Balance at beginning of period $ 6,246 $ 6,886
Provisions related to sales made in current year period 4,100 4,292
Provisions related to sales made in prior periods (148) (2)
Credits and payments (4,410) (4,807)
Translation differences (43) (7)
Balance at end of period 5,745 6,362
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 102 112
Credits and payments (106) (125)
Balance at end of period 83 162
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 2,895 3,006
Provisions related to sales made in current year period 1,370 1,350
Provisions related to sales made in prior periods (106)  
Credits and payments (1,513) (1,613)
Translation differences (21) (6)
Balance at end of period 2,625 2,737
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 233 324
Provisions related to sales made in prior periods (29) 1
Credits and payments (248) (438)
Translation differences (2) (1)
Balance at end of period 1,063 1,247
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,342 1,530
Provisions related to sales made in current year period 2,223 2,320
Provisions related to sales made in prior periods (16) (5)
Credits and payments (2,396) (2,413)
Translation differences (6)  
Balance at end of period 1,147 1,432
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 637 638
Provisions related to sales made in current year period 139 72
Provisions related to sales made in prior periods (1) 3
Credits and payments (112) (117)
Translation differences (4)  
Balance at end of period 659 596
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 176 176
Provisions related to sales made in current year period 33 114
Provisions related to sales made in prior periods 4 (1)
Credits and payments (35) (101)
Translation differences (10)  
Balance at end of period 168 188
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 3,998 4,180
Provisions related to sales made in prior periods (148) (2)
Credits and payments (4,304) (4,682)
Translation differences (43) (7)
Balance at end of period $ 5,662 $ 6,200