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Fixed Assets - Additional Information (Detail) - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]      
Depreciation expense relating to fixed assets $ 2.1 $ 2.3 $ 2.7
Building and Building Improvements | Minimum      
Property Plant And Equipment [Line Items]      
Useful Life 25 years    
Building and Building Improvements | Maximum      
Property Plant And Equipment [Line Items]      
Useful Life 30 years    
Machinery and Equipment | Minimum      
Property Plant And Equipment [Line Items]      
Useful Life 5 years    
Machinery and Equipment | Maximum      
Property Plant And Equipment [Line Items]      
Useful Life 10 years