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Impairment Testing (Carrying Amounts of Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Intangible assets [Line Items]    
Intangible assets having an indefined useful life $ 339 $ 357
Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 309 326
Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 30 31
Industrial Products, United States [Member] | Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 13 13
Phosphate Solutions, United States [Member] | Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 12 12
Industrial Products, Europe [Member] | Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 5 6
Industrial Products [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 92 93
Potash [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 19 20
Phosphate Solutions [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life 127 140
Innovative Ag Solutions [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefined useful life $ 71 $ 73