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Restructuring Costs - Schedule of Accrued Restructuring Costs Activity (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Reserve [Roll Forward]        
Beginning balance     $ 11  
Restructuring costs, net $ 5 $ 8 10 $ 10
Payments     (9)  
Ending balance 12   12  
Severance and termination costs        
Restructuring Reserve [Roll Forward]        
Beginning balance     7  
Restructuring costs, net     8  
Payments     (6)  
Ending balance 9   9  
Contract termination and other costs        
Restructuring Reserve [Roll Forward]        
Beginning balance     4  
Restructuring costs, net     2  
Payments     (3)  
Ending balance $ 3   $ 3