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Restructuring Costs - Schedule of Accrued Restructuring Costs Activity (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Reserve [Roll Forward]        
Beginning balance     $ 22  
Restructuring costs, net $ 8 $ 8 10 $ 19
Payments     (13)  
Ending balance 19   19  
Employee severance and termination benefits        
Restructuring Reserve [Roll Forward]        
Beginning balance     10  
Restructuring costs, net     9  
Payments     (6)  
Ending balance 13   13  
Exited contractual commitments and other        
Restructuring Reserve [Roll Forward]        
Beginning balance     12  
Restructuring costs, net     1  
Payments     (7)  
Ending balance $ 6   $ 6