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Schedule II - Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II—Valuation and Qualifying Accounts (EID and Corteva, Inc.)
(Dollars in millions)
For the Year Ended December 31,
202020192018
Accounts Receivable—Allowance for Doubtful Receivables 
Balance at beginning of period$174 $127 $64 
Additions charged to expenses154 69 80 
Deductions from reserves1
(120)(22)(17)
Balance at end of period$208 $174 $127 
Deferred Tax Assets—Valuation Allowance  
Balance at beginning of period$457 $669 $559 
Additions charged to expenses56 20 451 
Deductions from reserves2
(60)(232)(341)
Balance at end of period$453 $457 $669 
1.    Deductions include write-offs, recoveries collected and currency translation adjustments.
2. Deductions include currency translation adjustments.