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Fair Value (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Carrying And Fair Values Of Other Financial Assets And Liabilities | The following tables present the fair values of our other financial assets and liabilities on June 30, 2019, and December 31, 2018, and the basis for determining their fair values:
| Carrying Value |  | Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Financial Assets (Liabilities) | June 30, 2019
Measured at fair value: |  |  |  |  |  |  |  |  |
Marketable securities held in trust: |  |  |  |  |  |  |  |  |
Cash and equivalents | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |
Available-for-sale debt securities | 141 |  |  | 141 |  |  | — |  |  | 141 |  |  | — |
Equity securities | 50 |  |  | 50 |  |  | 50 |  |  | — |  |  | — |
Other investments | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |
Cash flow hedges | (19 | ) |  | (19 | ) |  | — |  |  | (19 | ) |  | — |
Measured at amortized cost: |  |  |  |  |  |  |  |  |
Short- and long-term debt principal | (14,026 | ) |  | (14,276 | ) |  | — |  |  | (14,276 | ) |  | — |
| December 31, 2018
Measured at fair value: |  |  |  |  |  |  |  |  |
Marketable securities held in trust: |  |  |  |  |  |  |  |  |
Cash and equivalents | $ | 29 |  |  | $ | 29 |  |  | $ | 23 |  |  | $ | 6 |  |  | $ | — |
Available-for-sale debt securities | 121 |  |  | 121 |  |  | — |  |  | 121 |  |  | — |
Equity securities | 52 |  |  | 52 |  |  | 52 |  |  | — |  |  | — |
Other investments | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |
Cash flow hedges | (69 | ) |  | (69 | ) |  | — |  |  | (69 | ) |  | — |
Measured at amortized cost: |  |  |  |  |  |  |  |  |
Short- and long-term debt principal | (12,518 | ) |  | (12,346 | ) |  | — |  |  | (12,346 | ) |  | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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