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Valuation of Debt and Equity Investments and Certain Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Investments | Details of our investments are as follows:
| September 30, 2018 |  |  | December 31, 2017 |
| Cash and Cash |  |  | Short-Term |  |  | Long-Term |  |  | Cash and Cash |  |  | Short-Term |  |  | Long-Term |
| Equivalents |  |  | Investments |  |  | Investments |  |  | Equivalents |  |  | Investments |  |  | Investments |
Measured at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ |  | 475 |  |  | $ |  | — |  |  | $ |  | — |  |  | $ |  | 525 |  |  | $ |  | — |  |  | $ |  | — |
Corporate obligations |  |  | 378 |  |  |  |  | 1,263 |  |  |  |  | — |  |  |  |  | 172 |  |  |  |  | 698 |  |  |  |  | — |
U.S. government agency and Treasury securities |  |  | 499 |  |  |  |  | 2,348 |  |  |  |  | — |  |  |  |  | 700 |  |  |  |  | 2,115 |  |  |  |  | — |
Trading securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | — |  |  |  |  | — |  |  |  |  | 253 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 236 |
Total |  |  | 1,352 |  |  |  |  | 3,611 |  |  |  |  | 253 |  |  |  |  | 1,397 |  |  |  |  | 2,813 |  |  |  |  | 236 |
Other measurement basis: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-method investments |  |  | — |  |  |  |  | — |  |  |  |  | 21 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 26 |
Non-marketable equity investments |  |  | — |  |  |  |  | — |  |  |  |  | 4 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 6 |
Cash on hand |  |  | 150 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 259 |  |  |  |  | — |  |  |  |  | — |
Total | $ |  | 1,502 |  |  | $ |  | 3,611 |  |  | $ |  | 278 |  |  | $ |  | 1,656 |  |  | $ |  | 2,813 |  |  | $ |  | 268 |
Aggregate Maturities of Available-for-sale Investments | The following table presents the aggregate maturities of our available-for-sale investments as of September 30, 2018:
Due |  | Fair Value |
One year or less |  | $ |  | 4,833 |
One to two years |  |  |  | 130 |
Assets and Liabilities Accounted for at Fair Value | The following are our assets and liabilities that were accounted for at fair value on a recurring basis. These tables do not include cash on hand, assets held by our postretirement plans, or assets and liabilities that are measured at historical cost or any basis other than fair value.
| September 30, 2018 |  |  | December 31, 2017 |
| Level 1 |  |  | Level 2 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ |  | 475 |  |  | $ |  | — |  |  | $ |  | 475 |  |  | $ |  | 525 |  |  | $ |  | — |  |  | $ |  | 525 |
Corporate obligations |  |  | — |  |  |  |  | 1,641 |  |  |  |  | 1,641 |  |  |  |  | — |  |  |  |  | 870 |  |  |  |  | 870 |
U.S. government agency and Treasury securities |  |  | 2,847 |  |  |  |  | — |  |  |  |  | 2,847 |  |  |  |  | 2,765 |  |  |  |  | 50 |  |  |  |  | 2,815 |
Mutual funds |  |  | 253 |  |  |  |  | — |  |  |  |  | 253 |  |  |  |  | 236 |  |  |  |  | — |  |  |  |  | 236 |
Total assets | $ |  | 3,575 |  |  | $ |  | 1,641 |  |  | $ |  | 5,216 |  |  | $ |  | 3,526 |  |  | $ |  | 920 |  |  | $ |  | 4,446 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation | $ |  | 271 |  |  | $ |  | — |  |  | $ |  | 271 |  |  | $ |  | 255 |  |  | $ |  | — |  |  | $ |  | 255 |
Total liabilities | $ |  | 271 |  |  | $ |  | — |  |  | $ |  | 271 |  |  | $ |  | 255 |  |  | $ |  | — |  |  | $ |  | 255 |

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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=109250915&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=99377789&loc=d3e19207-110258 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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