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Impairment Testing (Carrying Amounts of Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life $ 334 $ 339
Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 302 309
Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 32 30
Industrial Products [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 91 92
Industrial Products [Member] | Europe [Member] | Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 7 5
Industrial Products [Member] | USA [Member] | Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 13 13
Potash [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 18 19
Phosphate Solutions [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 123 127
Phosphate Solutions [Member] | USA [Member] | Trademarks [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life 12 12
Innovative Ag Solutions [Member] | Goodwill [Member]    
Intangible assets [Line Items]    
Intangible assets having an indefinite useful life $ 70 $ 71