At September 30, 2014, we held $280 million of investments in fixed income securities with maturities ranging from less than one year to November 2019, compared to $373 million of investments in fixed income securities held at December 31, 2013. These securities are accounted for as available-for-sale and recorded at fair value as follows: | | | | | | | | | | | | | | | | | | | | | | September 30, 2014 | | December 31, 2013 | Millions of dollars | Level 1 | Level 2 | Total | | Level 1 | Level 2 | Total | Fixed income securities: | | | | | | | | U.S. treasuries (a) | $ | — |
| $ | — |
| $ | — |
| | $ | 100 |
| $ | — |
| $ | 100 |
| Other (b) | — |
| 280 |
| 280 |
| | — |
| 273 |
| 273 |
| Total | $ | — |
| $ | 280 |
| $ | 280 |
| | $ | 100 |
| $ | 273 |
| $ | 373 |
|
| | (a) | These securities are classified as "Other current assets" in our condensed consolidated balance sheets. |
| | (b) | Of these securities, $131 million are classified as “Other current assets” and $149 million are classified as “Other assets” on our condensed consolidated balance sheets as of September 30, 2014, compared to $139 million classified as “Other current assets” and $134 million classified as “Other assets” as of December 31, 2013. These securities consist primarily of municipal bonds, corporate bonds, and other debt instruments. |
|