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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Measurements |
Fair Value of Assets and Liabilities Measured on Recurring Basis | Our assets and liabilities that are measured at fair value on a recurring basis include the following as of December 31 (in millions):
|  | 2018 |  | 2017
Fair Value Measurements Using: |  |  |  |  |  |
Quoted prices in active markets (Level 1): |  |  |  |  |  |
Money market funds |  | $ | 70 |  | $ | 225
|  |  | 70 |  |  | 225
Significant other observable inputs (Level 2): |  |  |  |  |  |
Available-for-sale securities |  |  | 288 |  |  | 96
|  |  | 288 |  |  | 96
Significant unobservable inputs (Level 3): |  |  |  |  |  |
Redeemable preferred stock |  |  | 66 |  |  | 55
|  |  | 66 |  |  | 55
Total Assets |  | $ | 424 |  | $ | 376

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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