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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 11,755 |  | $ 12,584 |  | $ 17,827
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 121 |  | 204 |  | 110
Actual Return (Loss) on Plan Assets Sold |  | (10) |  | (23) |  |
Actual Return (Loss) on Plan Assets Still Held |  | (13) |  | 9 |  |
Purchases, Sales, and Settlements |  | (41) |  | (14) |  |
Assets Transferred into (out of) Level 3 |  | (19) |  | 122 |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,908 |  |  |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2 |  | 0 |  | 2
Actual Return (Loss) on Plan Assets Sold |  | 0 |  | (15) |  |
Actual Return (Loss) on Plan Assets Still Held |  | (5) |  | 13 |  |
Purchases, Sales, and Settlements |  | 7 |  | 0 |  |
Assets Transferred into (out of) Level 3 |  | 0 |  | 0 |  |
Asset-backed Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 637 |  |  |  |
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Hedge Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5 |  |  |  |
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3 |  | 3 |  | 0
Actual Return (Loss) on Plan Assets Sold |  | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held |  | 0 |  | (8) |  |
Purchases, Sales, and Settlements |  | 0 |  | 0 |  |
Assets Transferred into (out of) Level 3 |  | 0 |  | 11 |  |
Private Market Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 6 |  |  |  |
Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 6 |  | 4 |  | 3
Actual Return (Loss) on Plan Assets Sold |  | 0 |  | (9) |  |
Actual Return (Loss) on Plan Assets Still Held |  | 2 |  | 10 |  |
Purchases, Sales, and Settlements |  | 0 |  | 0 |  |
Assets Transferred into (out of) Level 3 |  | 0 |  | 0 |  |
Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 52 |  |  |  |
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 52 |  | 132 |  | 26
Actual Return (Loss) on Plan Assets Sold |  | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held |  | (24) |  | 8 |  |
Purchases, Sales, and Settlements |  | (35) |  | (1) |  |
Assets Transferred into (out of) Level 3 |  | (21) |  | 99 |  |
Derivative, Asset [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 55 |  |  |  |
Derivative, Asset [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 55 |  |  |  |
Defined Benefit Plan, Equity Securities, US |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 1,108 |  |  |  |
Defined Benefit Plan, Equity Securities, US | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 1 | [1] | 3 | [2] | 4
Actual Return (Loss) on Plan Assets Sold |  | (1) |  | 1 |  |
Actual Return (Loss) on Plan Assets Still Held |  | 0 |  | 0 |  |
Purchases, Sales, and Settlements |  | (1) |  | (2) |  |
Assets Transferred into (out of) Level 3 |  | 0 |  | 0 |  |
Defined Benefit Plan, Equity Securities, Non-US |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 441 |  |  |  |
Defined Benefit Plan, Equity Securities, Non-US | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2 |  | 0 |  | 0
Actual Return (Loss) on Plan Assets Sold |  | (9) |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held |  | 10 |  | (13) |  |
Purchases, Sales, and Settlements |  | 1 |  | 1 |  |
Assets Transferred into (out of) Level 3 |  | 0 |  | 12 |  |
Other Contract | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 55 |  | 62 |  | $ 75
Actual Return (Loss) on Plan Assets Sold |  | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held |  | 4 |  | (1) |  |
Purchases, Sales, and Settlements |  | (13) |  | (12) |  |
Assets Transferred into (out of) Level 3 |  | $ 2 |  | $ 0 |  |
[1] | The Corteva pension plans directly held $204 million (approximately 2 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2023.
[2] | The Corteva pension plans directly held $250 million (approximately 2 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2022.

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