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Goodwill and Other Intangible Assets Goodwill by Segment (Details) - USD ($)
$ in Millions
 5 Months Ended 7 Months Ended 12 Months Ended
Jun. 01, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]          
Goodwill Beginning Balance $ 10,193 $ 10,179 $ 10,229 $ 10,193  
Currency Translation Adjustment (28) 60 69    
Other goodwill adjustments and acquisitions 14 [1] (10) [2] (29) [2]    
Goodwill Impairment Charge     0 0 $ 4,503
Realignment of segments 0        
Goodwill Ending Balance 10,179 10,229 10,269 10,229 10,193
Agriculture [Member]          
Goodwill [Line Items]          
Goodwill Beginning Balance 10,193 0 0 10,193  
Currency Translation Adjustment (28) 0 0    
Other goodwill adjustments and acquisitions 14 [1] 0 [2] 0 [2]    
Goodwill Impairment Charge         4,503
Realignment of segments (10,179)        
Goodwill Ending Balance 0 0 0 0 10,193
Crop Protection [Member]          
Goodwill [Line Items]          
Goodwill Beginning Balance 0 4,726 4,743 0  
Currency Translation Adjustment 0 28 31    
Other goodwill adjustments and acquisitions 0 [1] (11) [2] (29) [2]    
Realignment of segments 4,726        
Goodwill Ending Balance 4,726 4,743 4,745 4,743 0
Seed [Member]          
Goodwill [Line Items]          
Goodwill Beginning Balance 0 5,453 5,486 0  
Currency Translation Adjustment 0 32 38    
Other goodwill adjustments and acquisitions 0 [1] 1 [2] 0 [2]    
Realignment of segments 5,453        
Goodwill Ending Balance $ 5,453 $ 5,486 $ 5,524 $ 5,486 $ 0
[1] Primarily consists of the acquisition of a distributor in Greece.
[2] Primarily consists of the goodwill included in the sale of businesses in the crop protection segment.