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Financial Instruments and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments All Other Investments [Abstract] |
Schedule of Marketable Securities |
|  | December 31, 2018 |
|  | Total Amortized |  |  | Total Fair |  |  | Cash and Cash |  |  | Short-Term Marketable |
|  | Cost |  |  | Value (1) |  |  | Equivalents |  |  | Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 128 |  |  | $ | 128 |  |  | $ | 128 |  |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 20 |  |  |  | 20 |  |  |  | 5 |  |  |  | 15 |
Total |  | $ | 148 |  |  | $ | 148 |  |  | $ | 133 |  |  | $ | 15 |
(1) | As of December 31, 2018, any unrealized gains or losses related to our marketable securities were not material.
Notional Principal Amounts of Outstanding Derivative Instruments | The following table shows the notional principal amounts of our outstanding derivative instruments for the periods presented:
|  | December 31, 2019 |  |  | December 31, 2018 |
|  | (in millions) |
Foreign currency exchange-forward contracts (1)(2) |  | $ | 10 |  |  | $ | 13 |
(1) | Derivative contracts address foreign currency exchange fluctuations for the Euro versus the U.S. dollar. The Company had one and two outstanding derivative contracts as of December 31, 2019 and 2018, respectively. These outstanding derivatives are not designated as hedging instruments.
(2) | The fair value of our outstanding derivatives as of December 31, 2019 and 2018, respectively, was not material and was reported as a liability in accrued expenses and other current liabilities on our consolidated balance sheets.

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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