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Employee Benefits (Narratives) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
yr
Dec. 31, 2017
USD ($)
yr
Dec. 31, 2016
USD ($)
Notes to Consolidated Financial Statements [Abstract]      
Increase under provision for employee benefits relating to potash and Polysulphate $ 7    
Actual return (loss) on plan assets (1) $ 42 $ 47
Expenses recorded in respect of defined contribution plans 35 $ 37 $ 38
The Company's estimate of deposits expected in funded defined benefit plans for 2019 $ 10    
Life of defined benefit plans | yr 13.8 16.3