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Acquisition - Summary of Amounts Recognized for Assets and Liabilities Acquired (Detail) - USD ($)
$ in Millions
Oct. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 1,979 $ 2,099 $ 1,923
OLSA [Member]        
Business Acquisition [Line Items]        
Cash $ 17      
Non-cash working capital (52)      
Fixed assets 89      
Goodwill 109      
Intangibles 40      
Long-term debt (21)      
Other long-term liabilities (3)      
Deferred tax liabilities (10)      
Consideration paid 169      
Less: Cash acquired (17)      
Net cash outflow $ 152