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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Contributions $ 33 $ 36 $ 33
Amortized from accumulated other comprehensive income into net periodic benefit cost 7    
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 234 264  
Defined Benefit Plan, Accumulated Benefit Obligation 713 769  
Estimated future benefit payments, 2014 27    
Estimated future benefit payments, 2015 28    
Estimated future benefit payments, 2016 29    
Estimated future benefit payments, 2017 30    
Estimated future benefit payments, 2018 31    
Estimated future benefit payments, 2019 to 2023 172    
Contribution to multiemployer plans $ 9 $ 9 $ 9