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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue Recognition [Line Items]    
Balance at beginning of period $ 6,886 $ 8,077
Provisions related to sales made in current year period 17,150 19,413
Provisions related to sales made in prior periods (189) (59)
Credits and payments (17,605) (20,480)
Translation differences 4 (65)
Balance at end of period 6,246 6,886
Reserves Included in Accounts Receivable, Net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 175 196
Provisions related to sales made in current year period 383 514
Provisions related to sales made in prior periods   3
Credits and payments (471) (538)
Balance at end of period 87 175
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 3,006 3,077
Provisions related to sales made in current year period 5,552 6,572
Provisions related to sales made in prior periods (92) (14)
Credits and payments (5,570) (6,596)
Translation differences (1) (33)
Balance at end of period 2,895 3,006
Medicaid and Other Governmental Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,361 1,908
Provisions related to sales made in current year period 976 1,284
Provisions related to sales made in prior periods (151) 24
Credits and payments (1,076) (1,850)
Translation differences (1) (5)
Balance at end of period 1,109 1,361
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,530 1,849
Provisions related to sales made in current year period 9,565 10,206
Provisions related to sales made in prior periods (17)  
Credits and payments (9,736) (10,519)
Translation differences 1 (6)
Balance at end of period 1,342 1,530
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 638 780
Provisions related to sales made in current year period 281 442
Provisions related to sales made in prior periods 77 28
Credits and payments (360) (606)
Translation differences 1 (6)
Balance at end of period 637 638
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 176 267
Provisions related to sales made in current year period 394 417
Provisions related to sales made in prior periods (6) (30)
Credits and payments (392) (463)
Translation differences 4 (15)
Balance at end of period 176 176
Total Reserves Included in Sales Reserves and Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 6,711 7,881
Provisions related to sales made in current year period 16,767 18,899
Provisions related to sales made in prior periods (189) (62)
Credits and payments (17,134) (19,942)
Translation differences 4 (65)
Balance at end of period $ 6,159 $ 6,711