Pension Plans and Other Post Employment Benefit Plans Basis of Fair Value Measurement (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2025		Dec. 31, 2024		Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10,275		$ 10,630		$ 11,755
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,129		2,444
Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,711		5,761
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74		162		121
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,490		2,546
Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets, Excluding Trust Receivables and payables and assets measured at NAV	7,914		8,367
Defined Benefit Plan, Cash | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	876		1,030
Defined Benefit Plan, Cash | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Defined Benefit Plan, Cash | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Defined Benefit Plan, Cash | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	876		1,030
Defined Benefit Plan, Equity Securities, US | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	836	[1]	1,026	[2]
Defined Benefit Plan, Equity Securities, US | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	[1]	1	[2]
Defined Benefit Plan, Equity Securities, US | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	3	[2]	1
Defined Benefit Plan, Equity Securities, US | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23		21
Defined Benefit Plan, Equity Securities, US | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	837	[1]	1,030	[2]
Defined Benefit Plan, Equity Securities, Non-US | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	417		388
Defined Benefit Plan, Equity Securities, Non-US | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Defined Benefit Plan, Equity Securities, Non-US | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		1		2
Defined Benefit Plan, Equity Securities, Non-US | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22		20
Defined Benefit Plan, Equity Securities, Non-US | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	417		389
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
US Treasury and Government [Member] | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,540		1,628
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
US Treasury and Government [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42		39
US Treasury and Government [Member] | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,540		1,628
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Corporate Debt Securities [Member] | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,728		3,540
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0		2
Corporate Debt Securities [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3		3
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,728		3,540
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Asset-backed Securities [Member] | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	440		590
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	440		590
Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Hedge Funds [Member] | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2		2
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3		3		3
Hedge Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3		11
Hedge Funds [Member] | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5		5
Private Market Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Private Market Securities [Member] | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5		3		6
Private Market Securities [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,750		1,810
Private Market Securities [Member] | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5		3
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Real Estate [Member] | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4		101		52
Real Estate [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	647		642
Real Estate [Member] | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4		101
Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Other Investments [Member] | Fair value of the company's long-term borrowings, including long-term debt due within one year
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62		51		$ 55
Other Investments [Member] | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62		51
Pension trust receivables | Other Reconciling Items
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	79	[3]	79	[4]
Pension trust payables | Other Reconciling Items
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ (208)	[5]	$ (362)	[6]
Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount of Employer and Related Party Securities Included in Plan Assets, Percent			1.00%
Common Stock [Member] | Defined Benefit Plan, Equity Securities, US
Defined Benefit Plan Disclosure [Line Items]
Amount of Employer and Related Party Securities Included in Plan Assets			$ 132

[1] The Corteva pension plans directly held no Corteva, Inc. common stock at December 31, 2025.

[2] The Corteva pension plans directly held $132 million (approximately 1 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2024.

[3] Primarily receivables for investment securities sold.

[4] Primarily receivables for investments securities sold.

[5] Primarily payables for investment securities purchased.

[6] Primarily payables for investment securities purchased.