Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  |  | Fair Value Measurements as of December 31, 2018 | Fair Value Measurements as of December 31, 2018 | Fair Value Measurements as of December 31, 2018 | Fair Value Measurements as of December 31, 2018 |
| --- | --- | --- | --- | --- | --- |
|  |  | Total | Level 1 | Level 2 | Level 3 |
| Short-term investments (1) : | Money market funds | $14 | $14 | $— | $— |
| Short-term investments (1) : | Bank notes/certificates of deposit/time deposits | 2,435 | — | 2,435 | — |
| Short-term investments (1) : | Corporate obligations | 1,658 | — | 1,658 | — |
| Short-term investments (1) : | Repurchase agreements | 375 | — | 375 | — |
| Short-term investments (1) : |  | 4,482 | 14 | 4,468 | — |
| Short-term investments (1) : | Restricted cash and short-term investments (1) | 154 | 12 | 142 | — |
| Short-term investments (1) : | Long-term investments (3) | 189 | 189 | — | — |
| Short-term investments (1) : | Total | $4,825 | $215 | $4,610 | $— |
Question:
In 2018, how much were the Level 1 long-term investments for American Airlines? 
Answer:
189