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Revenue Disaggregation of Revenue - Principal Product Groups (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales |  | $ 1,863 | $ 1,911 | $ 11,010 | $ 10,863
Seed [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales |  | 523 | 681 | 6,516 | 6,347
Seed [Member] | Corn [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales |  | 303 | 372 | 4,224 | 4,149
Seed [Member] | Soybean [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales |  | 116 | 168 | 1,382 | 1,297
Seed [Member] | Other oilseeds [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales |  | 62 | 44 | 529 | 469
Seed [Member] | Other [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales |  | 42 | 97 | 381 | 432
Crop Protection [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales |  | 1,340 | 1,230 | 4,494 | 4,516
Crop Protection [Member] | Other [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | [1] | 101 | 81 | 247 | 253
Crop Protection [Member] | Herbicides [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | [1] | 583 | 574 | 2,315 | 2,338
Crop Protection [Member] | Insecticides [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | [1] | 395 | 330 | 1,218 | 1,158
Crop Protection [Member] | Fungicides [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | [1] | $ 261 | $ 245 | $ 714 | $ 767
[1] | Prior periods have been reclassified to conform to current period presentation.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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