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Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) and amounts recognized in other comprehensive loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  | $ (31) | $ (97)
Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service Cost |  | $ 26 | 41 | 136
Interest Cost |  | 559 | 769 | 755
Expected return on plan assets |  | (1,000) | (1,078) | (1,216)
Amortization of unrecognized loss (gain) |  | 4 | 3 | 10
Amortization of prior service benefit |  | (1) | (1) | 0
Curtailment gain |  | 0 | (2) | (11)
Settlement loss |  | 3 | 4 | 5
Net periodic benefit cost (credit) |  | (409) | (264) | (321)
Net loss (gain) |  | 247 | 970 | 908
Amortization of unrecognized (loss) gain |  | (4) | (2) | (10)
Prior service cost (benefit) |  | (3) | (11) | 17
Amortization of prior service benefit |  | 1 | 1 | 0
Settlement loss |  | (3) | (4) | (2)
Effect of foreign exchange rates |  | 2 | (5) | 1
Total (benefit) loss recognized in other comprehensive loss, attributable to Corteva |  | 240 | 949 | 914
Total recognized in net periodic benefit cost and other comprehensive (income) loss |  | (169) | 685 | 593
Other Post Employment Benefits Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service Cost |  | 2 | 4 | 9
Interest Cost |  | 66 | 84 | 85
Expected return on plan assets |  | 0 | 0 | 0
Amortization of unrecognized loss (gain) |  | 1 | (1) | 0
Amortization of prior service benefit |  | 0 | 0 | 0
Curtailment gain |  | 0 | 0 | 0
Settlement loss |  | 0 | 0 | 0
Net periodic benefit cost (credit) |  | 69 | 87 | 94
Net loss (gain) |  | 59 | 211 | (172)
Amortization of unrecognized (loss) gain |  | (1) | 1 | 0
Prior service cost (benefit) |  | (939) | 0 | 0
Amortization of prior service benefit |  | 0 | 0 | 0
Settlement loss |  | 0 | 0 | 0
Effect of foreign exchange rates |  | (1) | 0 | 0
Total (benefit) loss recognized in other comprehensive loss, attributable to Corteva |  | (882) | 212 | (172)
Total recognized in net periodic benefit cost and other comprehensive (income) loss |  | (813) | 299 | (78)
Discontinued Operations [Member] | Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net periodic benefit cost (credit) | [1] | 0 | (14) | (42)
Discontinued Operations [Member] | Other Post Employment Benefits Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net periodic benefit cost (credit) | [1] | 0 | 0 | 1
Continuing Operations [Member] | Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net periodic benefit cost (credit) |  | (409) | (250) | (279)
Continuing Operations [Member] | Other Post Employment Benefits Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net periodic benefit cost (credit) |  | $ 69 | $ 87 | $ 93
[1] | Includes non-service related components of net periodic benefit credit of $(31) million, and $(97) million for the years ended December 31, 2019 and 2018, respectively.

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