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Revenue from Contracts with Customers - Schedule of Sales Reserves and Allowances (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue Recognition [Line Items]    
Balance at beginning of period $ 4,904 $ 6,246
Provisions related to sales made in current year period 13,808 14,806
Provisions related to sales made in prior periods (318) (497)
Credits and payments (14,036) (15,707)
Translation differences (49) 56
Balance at end of period 4,309 4,904
Reserves Included in Accounts Receivable, Net [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 80 87
Provisions related to sales made in current year period 382 391
Provisions related to sales made in prior periods (9) 0
Credits and payments (385) (398)
Translation differences 0 0
Balance at end of period 68 80
Rebates [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 2,054 2,895
Provisions related to sales made in current year period 4,030 4,703
Provisions related to sales made in prior periods (125) (219)
Credits and payments (4,275) (5,360)
Translation differences (29) 35
Balance at end of period 1,655 2,054
Medicaid and Other Governmental Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 828 1,109
Provisions related to sales made in current year period 852 744
Provisions related to sales made in prior periods (51) (184)
Credits and payments (768) (849)
Translation differences (7) 8
Balance at end of period 854 828
Chargebacks [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 1,108 1,342
Provisions related to sales made in current year period 7,967 8,438
Provisions related to sales made in prior periods (47) (65)
Credits and payments (7,937) (8,614)
Translation differences (6) 7
Balance at end of period 1,085 1,108
Returns [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 686 637
Provisions related to sales made in current year period 263 459
Provisions related to sales made in prior periods (60) (28)
Credits and payments (350) (386)
Translation differences (4) 4
Balance at end of period 535 686
Other [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 148 176
Provisions related to sales made in current year period 314 71
Provisions related to sales made in prior periods (26) (1)
Credits and payments (321) (100)
Translation differences (3) 2
Balance at end of period 112 148
Total Reserves Included in Sales Reserves and Allowances [Member]    
Revenue Recognition [Line Items]    
Balance at beginning of period 4,824 6,159
Provisions related to sales made in current year period 13,426 14,415
Provisions related to sales made in prior periods (309) (497)
Credits and payments (13,651) (15,309)
Translation differences (49) 56
Balance at end of period $ 4,241 $ 4,824