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Segment, Geographic and Other Revenue Information - Narrative (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Operating_Segment
Country
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Country
Segment Reporting Information [Line Items]      
Number of operating segments | Operating_Segment 2    
Total assets | $ [1] $ 171,797 $ 171,615  
Geographic Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Outside United States [Member]      
Segment Reporting Information [Line Items]      
Number of countries outside the U.S | Country 11   12
Geographic Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | United States [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 10.00% 10.00% 10.00%
Geographic Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | JAPAN      
Segment Reporting Information [Line Items]      
Percentage of total revenues 8.00% 8.00% 8.00%
Geographic Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | CHINA      
Segment Reporting Information [Line Items]      
Percentage of total revenues 7.00% 6.00% 6.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Domestic Wholesaler One [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 16.00% 16.00% 14.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Domestic Wholesaler Two [Member]      
Segment Reporting Information [Line Items]      
Percentage of total revenues 12.00% 12.00% 11.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Domestic Wholesaler Three [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 36.00% 29.00% 23.00%
[1] Amounts may not add due to rounding.