Pension Plans and Other Post Employment Benefit Plans Summary of Fair Value Measurement of Level 3 Pension Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	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 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74		162		121
Actual Return (Loss) on Plan Assets Sold	(2)		(11)
Actual Return (Loss) on Plan Assets Still Held	9		(57)
Purchases, Sales, and Settlements	(1)		(5)
Assets Transferred into (out of) Level 3	(94)		114
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0		2
Actual Return (Loss) on Plan Assets Sold	0		(14)
Actual Return (Loss) on Plan Assets Still Held	0		14
Purchases, Sales, and Settlements	0		0
Assets Transferred into (out of) Level 3	0		(2)
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3		3		3
Actual Return (Loss) on Plan Assets Sold	0		0
Actual Return (Loss) on Plan Assets Still Held	0		0
Purchases, Sales, and Settlements	0		0
Assets Transferred into (out of) Level 3	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
Actual Return (Loss) on Plan Assets Sold	0		0
Actual Return (Loss) on Plan Assets Still Held	2		(3)
Purchases, Sales, and Settlements	0		0
Assets Transferred into (out of) Level 3	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
Actual Return (Loss) on Plan Assets Sold	0		0
Actual Return (Loss) on Plan Assets Still Held	(3)		(68)
Purchases, Sales, and Settlements	0		1
Assets Transferred into (out of) Level 3	(94)		116
Derivative, Asset [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62		51		55
Actual Return (Loss) on Plan Assets Sold	0		0
Actual Return (Loss) on Plan Assets Still Held	9		(2)
Purchases, Sales, and Settlements	2		(2)
Assets Transferred into (out of) Level 3	0		0
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
Actual Return (Loss) on Plan Assets Sold	(1)		0
Actual Return (Loss) on Plan Assets Still Held	1		2
Purchases, Sales, and Settlements	(3)		0
Assets Transferred into (out of) Level 3	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
Actual Return (Loss) on Plan Assets Sold	(1)		3
Actual Return (Loss) on Plan Assets Still Held	0		0
Purchases, Sales, and Settlements	0		(4)
Assets Transferred into (out of) Level 3	$ 0		$ 0

[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.