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Impairment Testing (Carrying Amounts of Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life $ 353 $ 334
Goodwill [Member]    
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life 320 302
Trademarks [Member]    
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life 33 32
Industrial Products [Member] | Goodwill [Member]    
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life 94 91
Potash [Member] | Goodwill [Member]    
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life 19 18
Phosphate Solutions [Member] | Goodwill [Member]    
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life 116 123
Innovative Ag Solutions [Member] | Goodwill [Member]    
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life 73 70
Other activities [Member] | Goodwill [Member]    
Intangible assets having an indefinite useful life [Line Items]    
Intangible assets having an indefinite useful life $ 18 $ 0