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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
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 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Fair Value Measurements Using: | ​ | ​ | ​ | ​ | ​ | ​
Quoted prices in active markets (Level 1): | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents and money market funds (a) |  | $ | 87 |  | $ | 530
Significant other observable inputs (Level 2): | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities (b) |  | ​ | 447 |  | ​ | 390
Significant unobservable inputs (Level 3): | ​ | ​ | ​ | ​ | ​ | ​
Redeemable preferred stock (c) |  | ​ | 49 |  | ​ | 49
Total Assets |  | $ | 583 | ​ | $ | 969
(a) | The decrease is primarily due to the use of available cash to retire certain high-coupon senior notes in May 2021, which is discussed further in Note 3.
(b) | Our available-for-sale securities primarily relate to debt securities with maturities over the next nine years.
(c) | When available, Level 3 investments have been measured based on third-party investors’ recent or pending transactions in these securities, which are considered the best evidence of fair value. When this evidence is not available, we use other valuation techniques as appropriate and available. These valuation methodologies may include transactions in similar instruments, discounted cash flow techniques, third-party appraisals or industry multiples and public company comparable transactions.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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