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Fair Value Measurements Nonrecurring Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 4,117 | $ 4,474 | $ 4,117 | $ 4,152
Equity Method Investment, Other than Temporary Impairment |  | 41 |  | 41 |
Technology-Based Intangible Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  | 0 |  |
Other Intangible Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  | 0 |  |
In Process Research and Development [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  | (47) | (85) |
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure |  | 450 | 0 | 450 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure |  | 51 |  | 51 |
Fair Value, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  | (41) |
Technology-Based Intangible Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  | (1) |  |
Other Intangible Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | [1],[2] | $ 530 | 401 | $ 530 | $ 538
Asset Impairment Charges |  |  | $ (6) |  |
[1] | Primarily consists of sales and farmer networks, marketing and manufacturing alliances and noncompetition agreements.
[2] | Refer to discussion of interim impairment analysis completed below.

X
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=118954474&loc=d3e32787-111569 + Details
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