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Restructuring (Narrative) (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Employee
Sep. 30, 2019
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring Charges $ 17 $ 22 $ 89 $ 66
Restructuring and Related Cost, Expected Cost Remaining 2 $ 12 2 $ 12
2020 Optimization [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Charges     $ 59  
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee     3,600  
Restructuring and Related Cost, Number of Positions Eliminated | Employee     3,500  
Restructuring and Related Cost, Expected Cost Remaining 7   $ 7  
Brazil Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Charges     $ 2  
Restructuring and Related Cost, Number of Positions Eliminated | Employee     20  
Restructuring and Related Cost, Expected Cost Remaining $ 5   $ 5