Pension Plans and Other Post Employment Benefit Plans Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 21,000	$ 23,200
Noncurrent liabilities	(6,377)	(5,677)
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net amount recognized	(4,063)	(4,581)	[1]
Net loss (gain)	1,641	767
Prior service (benefit) cost	(10)	17
Pretax balance in accumulated other comprehensive (income) loss at end of year	1,631	784
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation		(41)
Other Post Employment Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net amount recognized	(2,591)	(2,514)	[1]
Net loss (gain)	108	(104)
Prior service (benefit) cost	0	0
Pretax balance in accumulated other comprehensive (income) loss at end of year	108	(104)
Assets of discontinued operations - current [Member] | Discontinued Operations [Member] | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Assets	0	10
Assets of discontinued operations - current [Member] | Discontinued Operations [Member] | Other Post Employment Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Assets	0	0
Other Assets [Member] | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Assets	10	0
Other Assets [Member] | Other Post Employment Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Assets	0	0
Accrued and Other Current Liabilities [Member] | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities	(50)	(45)
Accrued and Other Current Liabilities [Member] | Other Post Employment Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities	(237)	(242)
Liabilities of discontinued operations - non-current [Member] | Discontinued Operations [Member] | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities	0	(1,158)
Liabilities of discontinued operations - non-current [Member] | Discontinued Operations [Member] | Other Post Employment Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities	0	(24)
Pension and other post employment benefits - noncurrent [Member] | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent liabilities	(4,023)	(3,388)
Pension and other post employment benefits - noncurrent [Member] | Other Post Employment Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent liabilities	$ (2,354)	$ (2,248)

[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.