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, 2021		Dec. 31, 2020		Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 17,827		$ 17,835		$ 16,941
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	110		115		52
Actual Return (Loss) on Plan Assets Sold	(5)		(38)
Actual Return (Loss) on Plan Assets Still Held	(2)		34
Purchases, Sales, and Settlements	2		5
Assets Transferred into (out of) Level 3			62
Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,591		2,579
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2		3		4
Actual Return (Loss) on Plan Assets Sold	(5)		(7)
Actual Return (Loss) on Plan Assets Still Held	6		5
Purchases, Sales, and Settlements	(2)		0
Assets Transferred into (out of) Level 3			1
Asset-backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	682		616
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Private Market Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3		3
Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3		3		2
Actual Return (Loss) on Plan Assets Sold	0		0
Actual Return (Loss) on Plan Assets Still Held	0		1
Purchases, Sales, and Settlements	0		0
Assets Transferred into (out of) Level 3			0
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26		28
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26		28		33
Actual Return (Loss) on Plan Assets Sold	0		0
Actual Return (Loss) on Plan Assets Still Held	(2)		(5)
Purchases, Sales, and Settlements	0		0
Assets Transferred into (out of) Level 3			0
Derivative, Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78		76
Derivative, Asset [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75		73		0
Actual Return (Loss) on Plan Assets Sold	0		0
Actual Return (Loss) on Plan Assets Still Held	(2)		7
Purchases, Sales, and Settlements	4		5
Assets Transferred into (out of) Level 3			61
Non-US [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,523		2,194
Non-US [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		3		4
Actual Return (Loss) on Plan Assets Sold	(1)		(6)
Actual Return (Loss) on Plan Assets Still Held	(1)		5
Purchases, Sales, and Settlements	(1)		0
Assets Transferred into (out of) Level 3			0
UNITED STATES | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,400	[1]	3,905	[2]
UNITED STATES | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	[1]	5	[2]	$ 9
Actual Return (Loss) on Plan Assets Sold	1		(25)
Actual Return (Loss) on Plan Assets Still Held	(3)		21
Purchases, Sales, and Settlements	$ 1		0
Assets Transferred into (out of) Level 3			$ 0

[1] The Corteva pension plans directly held $201 million (approximately 1 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2021.

[2] The Corteva pension plans directly held $165 million (approximately 1 percent of total plan assets) of Corteva, Inc. at December 31, 2020.