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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | $ 17,827 |  | $ 17,835 |  | $ 16,941
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 110 |  | 115 |  | 52
Actual Return (Loss) on Plan Assets Sold | (5) |  | (38) |  |
Actual Return (Loss) on Plan Assets Still Held | (2) |  | 34 |  |
Purchases, Sales, and Settlements | 2 |  | 5 |  |
Assets Transferred into (out of) Level 3 |  |  | 62 |  |
Corporate Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 4,591 |  | 2,579 |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2 |  | 3 |  | 4
Actual Return (Loss) on Plan Assets Sold | (5) |  | (7) |  |
Actual Return (Loss) on Plan Assets Still Held | 6 |  | 5 |  |
Purchases, Sales, and Settlements | (2) |  | 0 |  |
Assets Transferred into (out of) Level 3 |  |  | 1 |  |
Asset-backed Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 682 |  | 616 |  |
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 |  | 3 |  |
Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 3 |  | 3 |  | 2
Actual Return (Loss) on Plan Assets Sold | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held | 0 |  | 1 |  |
Purchases, Sales, and Settlements | 0 |  | 0 |  |
Assets Transferred into (out of) Level 3 |  |  | 0 |  |
Real Estate [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 26 |  | 28 |  |
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 26 |  | 28 |  | 33
Actual Return (Loss) on Plan Assets Sold | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held | (2) |  | (5) |  |
Purchases, Sales, and Settlements | 0 |  | 0 |  |
Assets Transferred into (out of) Level 3 |  |  | 0 |  |
Derivative, Asset [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 78 |  | 76 |  |
Derivative, Asset [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 75 |  | 73 |  | 0
Actual Return (Loss) on Plan Assets Sold | 0 |  | 0 |  |
Actual Return (Loss) on Plan Assets Still Held | (2) |  | 7 |  |
Purchases, Sales, and Settlements | 4 |  | 5 |  |
Assets Transferred into (out of) Level 3 |  |  | 61 |  |
Non-US [Member] | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 1,523 |  | 2,194 |  |
Non-US [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0 |  | 3 |  | 4
Actual Return (Loss) on Plan Assets Sold | (1) |  | (6) |  |
Actual Return (Loss) on Plan Assets Still Held | (1) |  | 5 |  |
Purchases, Sales, and Settlements | (1) |  | 0 |  |
Assets Transferred into (out of) Level 3 |  |  | 0 |  |
UNITED STATES | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 2,400 | [1] | 3,905 | [2] |
UNITED STATES | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 4 | [1] | 5 | [2] | $ 9
Actual Return (Loss) on Plan Assets Sold | 1 |  | (25) |  |
Actual Return (Loss) on Plan Assets Still Held | (3) |  | 21 |  |
Purchases, Sales, and Settlements | $ 1 |  | 0 |  |
Assets Transferred into (out of) Level 3 |  |  | $ 0 |  |
[1] | The Corteva pension plans directly held $201 million (approximately 1 percent of total plan assets) of Corteva, Inc. common stock at December 31, 2021.
[2] | 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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