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Goodwill and Other Intangible Assets Goodwill by Segment (Details) - USD ($)
$ in Millions
 1 Months Ended 5 Months Ended
Jun. 30, 2019
May 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill Beginning Balance $ 10,179 $ 10,193  
Currency Translation Adjustment 70 (28)  
Other goodwill adjustments and acquisitions   14  
Segment realignment   0  
Goodwill Ending Balance 10,249    
Agriculture [Member]      
Goodwill [Line Items]      
Goodwill Beginning Balance 0 10,193 [1]  
Currency Translation Adjustment 0 (28)  
Other goodwill adjustments and acquisitions [2]   14  
Segment realignment   (10,179)  
Goodwill Ending Balance 0    
Goodwill, Impaired, Accumulated Impairment Loss     $ 4,503
Crop Protection [Member]      
Goodwill [Line Items]      
Goodwill Beginning Balance 4,726 0  
Currency Translation Adjustment 33 0  
Other goodwill adjustments and acquisitions   0  
Segment realignment   4,726  
Goodwill Ending Balance 4,759    
Seed [Member]      
Goodwill [Line Items]      
Goodwill Beginning Balance 5,453 0  
Currency Translation Adjustment 37 0  
Other goodwill adjustments and acquisitions   0  
Segment realignment   $ 5,453  
Goodwill Ending Balance $ 5,490    
[1]
Net of accumulated impairment losses of $4,503 million.
[2]
Primarily consists of the acquisition of a distributor in Greece.