Pension Plans and Other Post Employment Benefit Plans Additional Information (Details) $ in Millions		1 Months Ended	3 Months Ended	4 Months Ended	5 Months Ended	8 Months Ended	12 Months Ended
		Nov. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 01, 2019 USD ($)	Aug. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2016
Defined Benefit and Contribution Disclosures [Line Items]
Defined Benefit Plan, Unfunded Status of Plan					$ 5,800
Pre-tax cash requirements to cover actual net claims costs and related administrative expenses				$ 59		$ 166	$ 202	$ 216
Trust Asset					319
Expected long-term rate of return on plan assets				6.25%		8.00%
U.S. Retirement Savings Plan [Member]
Defined Benefit and Contribution Disclosures [Line Items]
Employer Matching Contribution, Percent of Match							100.00%
Employer Matching Contribution, Percent of Employees' Gross Pay							6.00%
Employer Discretionary Contribution Percent							3.00%
Defined Contribution Plan, Employer Contribution				$ 53		$ 129	$ 142	183
Employers Discretionary Contribution, Vesting Period							3 years
Corteva Other Contribution Plans [Member]
Defined Benefit and Contribution Disclosures [Line Items]
Defined Contribution Plan, Employer Contribution				$ 30		$ 33	$ 46	82
Pension Plan
Defined Benefit and Contribution Disclosures [Line Items]
Defined Benefit Plan, Unfunded Status of Plan	[1]						(4,063)	(4,581)
Employer contributions							$ 121	$ 1,314
Expected long-term rate of return on plan assets				6.24%		7.66%	6.24%	6.19%
Pension Plan | Principal U.S. Pension Plan [Member]
Defined Benefit and Contribution Disclosures [Line Items]
Expected long-term rate of return on plan assets				6.25%		8.00%	6.25%	6.25%
Principal U.S. Pension Plan [Member]
Defined Benefit and Contribution Disclosures [Line Items]
Employer contributions			$ 1,100			$ 2,900
Other Post Employment Benefits Plan
Defined Benefit and Contribution Disclosures [Line Items]
Defined Benefit Plan, Unfunded Status of Plan	[1]						$ (2,591)	$ (2,514)
Employer contributions							202	216
Expected Future Employer Contributions, Next Fiscal Year									$ 240
Eligible Employee Age Threshold										50
Other Pension Plan [Member]
Defined Benefit and Contribution Disclosures [Line Items]
Employer contributions				$ 69		124	121	214
Expected Future Employer Contributions, Next Fiscal Year									$ 60
Nonqualified Plan [Member] | Trust Agreement [Member]
Defined Benefit and Contribution Disclosures [Line Items]
Contributions to Trust		$ 571
Trust Asset Distribution					$ 39		62	68
Trust Asset							409	500
Discontinued Operations [Member] | Corteva Other Contribution Plans [Member]
Defined Benefit and Contribution Disclosures [Line Items]
Defined Contribution Plan, Employer Contribution				$ 42		$ 107	$ 73	$ 148

[1] Excludes $(41) million as of December 31, 2018 of DAS pension and OPEB liabilities recognized within the Consolidated Balance Sheet that did not transfer to Corteva as part of the Internal Reorganizations.