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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | $ 17,835 |  | $ 16,941 |  | $ 18,951
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 115 |  | 52 |  | 330
Actual Return (Loss) on Plan Assets Sold | (38) |  | (21) |  |
Actual Return (Loss) on Plan Assets Still Held | 34 |  | 16 |  |
Purchases, Sales, and Settlements | 5 |  | (14) |  |
Assets Transferred into (out of) Level 3 | 62 |  | 0 |  |
Plan assets transferred due to sale, liquidation, spin-off, or divestiture |  |  | (259) |  |
Corporate Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2,579 |  | 2,956 |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3 |  | 4 |  | 14
Actual Return (Loss) on Plan Assets Sold | (7) |  | 9 |  |
Actual Return (Loss) on Plan Assets Still Held | 5 |  | (8) |  |
Purchases, Sales, and Settlements | 0 |  | (12) |  |
Assets Transferred into (out of) Level 3 | 1 |  | 1 |  |
Plan assets transferred due to sale, liquidation, spin-off, or divestiture |  |  | 0 |  |
Asset-backed Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 616 |  | 663 |  |
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 |  | 2 |  |
Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3 |  | 2 |  | 1
Actual Return (Loss) on Plan Assets Sold | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held | 1 |  | 4 |  |
Purchases, Sales, and Settlements | 0 |  | (3) |  |
Assets Transferred into (out of) Level 3 | 0 |  | 0 |  |
Plan assets transferred due to sale, liquidation, spin-off, or divestiture |  |  | 0 |  |
Real Estate [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 28 |  | 33 |  |
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 28 |  | 33 |  | 93
Actual Return (Loss) on Plan Assets Sold | 0 |  | (29) |  |
Actual Return (Loss) on Plan Assets Still Held | (5) |  | 25 |  |
Purchases, Sales, and Settlements | 0 |  | (3) |  |
Assets Transferred into (out of) Level 3 | 0 |  | 0 |  |
Plan assets transferred due to sale, liquidation, spin-off, or divestiture |  |  | (53) |  |
Derivative, Asset [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 76 |  | 19 |  |
Derivative, Asset [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 73 |  | 0 |  | 206
Actual Return (Loss) on Plan Assets Sold | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held | 7 |  | 0 |  |
Purchases, Sales, and Settlements | 5 |  | 0 |  |
Assets Transferred into (out of) Level 3 | 61 |  | 0 |  |
Plan assets transferred due to sale, liquidation, spin-off, or divestiture |  |  | (206) |  |
Non-US [Member] | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2,194 |  | 2,053 |  |
Non-US [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3 |  | 4 |  | 2
Actual Return (Loss) on Plan Assets Sold | (6) |  | 1 |  |
Actual Return (Loss) on Plan Assets Still Held | 5 |  | 0 |  |
Purchases, Sales, and Settlements | 0 |  | 2 |  |
Assets Transferred into (out of) Level 3 | 0 |  | (1) |  |
Plan assets transferred due to sale, liquidation, spin-off, or divestiture |  |  | 0 |  |
UNITED STATES | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3,905 | [1] | 3,665 | [2] |
UNITED STATES | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 5 | [1] | 9 | [2] | $ 14
Actual Return (Loss) on Plan Assets Sold | (25) |  | (2) |  |
Actual Return (Loss) on Plan Assets Still Held | 21 |  | (5) |  |
Purchases, Sales, and Settlements | 0 |  | 2 |  |
Assets Transferred into (out of) Level 3 | $ 0 |  | 0 |  |
Plan assets transferred due to sale, liquidation, spin-off, or divestiture |  |  | $ 0 |  |
[1] | The Corteva pension plans directly held $165 million (approximately 1 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2020.
[2] | The Corteva pension plans directly held $126 million (approximately 1 percent of total plan assets) of Corteva, Inc. at December 31, 2019.

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