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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Revenue Recognition [Line Items]  
Balance at beginning of period $ 8,077
Provisions related to sales made in current year period 19,413
Provisions related to sales made in prior periods (59)
Credits and payments (20,480)
Translation differences (65)
Balance at end of period 6,886
Reserves Included in Accounts Receivable, Net [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 196
Provisions related to sales made in current year period 514
Provisions related to sales made in prior periods 3
Credits and payments (538)
Balance at end of period 175
Rebates [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 3,077
Provisions related to sales made in current year period 6,572
Provisions related to sales made in prior periods (14)
Credits and payments (6,596)
Translation differences (33)
Balance at end of period 3,006
Medicaid and Other Governmental Allowances [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 1,908
Provisions related to sales made in current year period 1,284
Provisions related to sales made in prior periods 24
Credits and payments (1,850)
Translation differences (5)
Balance at end of period 1,361
Chargebacks [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 1,849
Provisions related to sales made in current year period 10,206
Credits and payments (10,519)
Translation differences (6)
Balance at end of period 1,530
Returns [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 780
Provisions related to sales made in current year period 442
Provisions related to sales made in prior periods 28
Credits and payments (606)
Translation differences (6)
Balance at end of period 638
Other [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 267
Provisions related to sales made in current year period 417
Provisions related to sales made in prior periods (30)
Credits and payments (463)
Translation differences (15)
Balance at end of period 176
Total Reserves Included in Sales Reserves and Allowances [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 7,881
Provisions related to sales made in current year period 18,899
Provisions related to sales made in prior periods (62)
Credits and payments (19,942)
Translation differences (65)
Balance at end of period $ 6,711