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Restructuring (Narrative) (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Employee
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Employee
Sep. 30, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring Charges $ 22 $ 4 $ 66 $ 14
BRAZIL        
Restructuring Cost and Reserve [Line Items]        
Restructuring and Related Cost, Number of Positions Eliminated | Employee 175      
Brazil Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Charges $ 6   6  
Restructuring and Related Cost, Expected Cost Remaining 10   10  
T19 Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Charges     $ 45  
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee     470  
Restructuring and Related Cost, Number of Positions Eliminated | Employee     365  
Restructuring and Related Cost, Expected Cost Remaining $ 15   $ 15