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Business Acquisition - Summary of Amounts Recognized for Assets and Liabilities Acquired (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 1,976 $ 1,979 $ 2,099
Adjustments to 2018 acquisitions [Member]      
Business Acquisition [Line Items]      
Non-cash working capital 2    
Goodwill (10)    
Deferred tax liabilities 8    
2019 Acquisitions [Member]      
Business Acquisition [Line Items]      
Cash 13    
Non-cash working capital 10    
Fixed assets 113    
Goodwill 22    
Other assets 1    
Intangibles 12    
Deferred tax assets 2    
Long-term debt (8)    
Other long-term liabilities (1)    
Deferred tax liabilities (4)    
Consideration paid 160    
Less: Cash acquired (13)    
Net cash outflow 147    
Allocation [Member]      
Business Acquisition [Line Items]      
Cash 13    
Non-cash working capital 12    
Fixed assets 113    
Goodwill 12    
Other assets 1    
Intangibles 12    
Deferred tax assets 2    
Long-term debt (8)    
Other long-term liabilities (1)    
Deferred tax liabilities 4    
Consideration paid 160    
Less: Cash acquired (13)    
Net cash outflow $ 147