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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2019
USD ($)
Revenue Recognition [Line Items]  
Balance at beginning of period $ 6,886
Provisions related to sales made in current year period 8,656
Provisions related to sales made in prior periods 1
Credits and payments (9,294)
Translation differences 12
Balance at end of period 6,261
Reserves Included in Accounts Receivable, Net [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 175
Provisions related to sales made in current year period 229
Credits and payments (242)
Balance at end of period 162
Rebates [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 3,006
Provisions related to sales made in current year period 2,651
Provisions related to sales made in prior periods 7
Credits and payments (2,975)
Translation differences 4
Balance at end of period 2,693
Medicaid and Other Governmental Allowances [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 1,361
Provisions related to sales made in current year period 548
Credits and payments (739)
Balance at end of period 1,170
Chargebacks [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 1,530
Provisions related to sales made in current year period 4,822
Provisions related to sales made in prior periods (5)
Credits and payments (4,936)
Translation differences 2
Balance at end of period 1,413
Returns [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 638
Provisions related to sales made in current year period 148
Provisions related to sales made in prior periods 3
Credits and payments (196)
Translation differences 2
Balance at end of period 595
Other [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 176
Provisions related to sales made in current year period 213
Provisions related to sales made in prior periods (4)
Credits and payments (206)
Translation differences 4
Balance at end of period 183
Total Reserves Included in Sales Reserves and Allowances [Member]  
Revenue Recognition [Line Items]  
Balance at beginning of period 6,711
Provisions related to sales made in current year period 8,427
Provisions related to sales made in prior periods 1
Credits and payments (9,052)
Translation differences 12
Balance at end of period $ 6,054