v3.19.3.a.u2
Segment, Geographic and Other Revenue Information - Narrative (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Operating_Segment
Country
Dec. 31, 2018
USD ($)
Operating_Segment
Country
Dec. 31, 2017
Country
Segment Reporting Information [Line Items]      
Number of operating segments | Operating_Segment 3 2  
Total assets | $ $ 167,489 $ 159,422  
Geographic Concentration Risk [Member] | Revenue [Member] | Outside United States [Member]      
Segment Reporting Information [Line Items]      
Number of countries outside the U.S | Country 11 11 11
Geographic Concentration Risk [Member] | Revenue [Member] | United States [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 10.00% 10.00% 10.00%
Geographic Concentration Risk [Member] | Revenue [Member] | JAPAN      
Segment Reporting Information [Line Items]      
Percentage of total revenues 8.00% 8.00% 8.00%
Geographic Concentration Risk [Member] | Revenue [Member] | CHINA      
Segment Reporting Information [Line Items]      
Percentage of total revenues 9.00% 8.00% 7.00%
Customer Concentration Risk [Member] | Revenue [Member] | McKesson, Inc. [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 16.00% 15.00% 16.00%
Customer Concentration Risk [Member] | Revenue [Member] | AmerisourceBergen Corporation [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 12.00% 11.00% 12.00%
Customer Concentration Risk [Member] | Revenue [Member] | Cardinal Health, Inc. [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 10.00% 10.00% 10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Largest U.S. Wholesaler Customers [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 25.00% 34.00% 36.00%