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Pension Plans and Other Post Employment Benefit Plans Basis of Fair Value Measurement (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension Trust Receivables | $ 655 | [1] | $ 214 | [2] |
Pension Trust Payables | (1,031) | [3] | (434) | [4] |
Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 17,827 |  | 17,835 |  | $ 16,941
Investments Measured at Net Asset Value | 3,086 |  | 2,469 |  |
Fair Value of Plan Assets, Excluding Trust Receivables and payables and assets measured at NAV | 15,117 |  | 15,586 |  |
Pension Plan | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 6,460 |  | 8,703 |  |
Pension Plan | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 8,547 |  | 6,768 |  |
Pension Plan | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 110 |  | 115 |  | 52
Pension Plan | Cash and Cash Equivalents [Domain] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2,543 |  | 2,616 |  |
Pension Plan | Cash and Cash Equivalents [Domain] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2,543 |  | 2,616 |  |
Pension Plan | Cash and Cash Equivalents [Domain] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Cash and Cash Equivalents [Domain] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | US Treasury and Government [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3,271 |  | 3,569 |  |
Investments Measured at Net Asset Value | 37 |  | 36 |  |
Pension Plan | US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3,271 |  | 3,569 |  |
Pension Plan | US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Corporate Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 4,591 |  | 2,579 |  |
Investments Measured at Net Asset Value | 7 |  | 7 |  |
Pension Plan | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 4,589 |  | 2,576 |  |
Pension Plan | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2 |  | 3 |  | 4
Pension Plan | Asset-backed Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 682 |  | 616 |  |
Pension Plan | Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 682 |  | 616 |  |
Pension Plan | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Hedge Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Investments Measured at Net Asset Value | 394 |  | 391 |  |
Pension Plan | Private Market Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3 |  | 3 |  |
Investments Measured at Net Asset Value | 1,822 |  | 1,381 |  |
Pension Plan | Private Market Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Private Market Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3 |  | 3 |  | 2
Pension Plan | Real Estate [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 26 |  | 28 |  |
Investments Measured at Net Asset Value | 759 |  | 590 |  |
Pension Plan | Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 26 |  | 28 |  | 33
Pension Plan | Other Investments [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 78 |  | 76 |  |
Pension Plan | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 0 |  |
Pension Plan | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3 |  | 3 |  |
Pension Plan | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 75 |  | 73 |  | 0
Non-US [Member] | Pension Plan | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 1,523 |  | 2,194 |  |
Investments Measured at Net Asset Value | 34 |  | 32 |  |
Non-US [Member] | Pension Plan | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 1,523 |  | 2,189 |  |
Non-US [Member] | Pension Plan | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 2 |  |
Non-US [Member] | Pension Plan | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 3 |  | 4
UNITED STATES | Pension Plan | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2,400 | [5] | 3,905 | [6] |
Investments Measured at Net Asset Value | 33 |  | 32 |  |
UNITED STATES | Pension Plan | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2,394 | [5] | 3,898 | [6] |
UNITED STATES | Pension Plan | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2 | [5] | 2 | [6] |
UNITED STATES | Pension Plan | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | $ 4 | [5] | 5 | [6] | $ 9
Common Stock [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amount of Employer and Related Party Securities Included in Plan Assets, Percent | 1.00% |  |  |  |
Common Stock [Member] | Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amount of Employer and Related Party Securities Included in Plan Assets | $ 201 |  | $ 165 |  |
Amount of Employer and Related Party Securities Included in Plan Assets, Percent |  |  | 1.00% |  |
[1] | Primarily receivables for investments securities sold.
[2] | Primarily receivables for investments securities sold.
[3] | Primarily payables for investment securities purchased.
[4] | Primarily payables for investment securities purchased.
[5] | The Corteva pension plans directly held $201 million (approximately 1 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2021.
[6] | The Corteva pension plans directly held $165 million (approximately 1 percent of total plan assets) of Corteva, Inc. at December 31, 2020.

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