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Impairment and Restructuring Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Mar. 31, 2019
Restructuring and asset impairment charges        
Restructuring charges $ 3 $ 10    
Argentina employee-related severance        
Restructuring and asset impairment charges        
Restructuring charges   11    
Finance transformation initiative in North America        
Restructuring and asset impairment charges        
Restructuring charges 2      
Finance transformation initiative in North America | Minimum | Forecast        
Restructuring and asset impairment charges        
Restructuring charges     $ 1  
Finance transformation initiative in North America | Maximum | Forecast        
Restructuring and asset impairment charges        
Restructuring charges     2  
Stevia Leaf Extraction Process in Brazil        
Restructuring and asset impairment charges        
Restructuring charges 1      
IT transformation        
Restructuring and asset impairment charges        
Reduction in expected restructuring charges in 2017   $ 1    
Employee Severance related costs        
Restructuring accrual        
Balance in severance accrual at December 31, 2017 11   $ 8 $ 8
Payments made to terminated employees (3)      
Balance in severance accrual at March 31, 2018 $ 8      
Employee Severance related costs | Forecast        
Restructuring accrual        
Payments made to terminated employees       $ (7)