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)   (2) : | Money market funds | $16 | $16 | $— | $— |
| Short-term investments (1)   (2) : | Corporate obligations | 1,658 | — | 1,658 | — |
| Short-term investments (1)   (2) : | Bank notes/certificates of deposit/time deposits | 2,436 | — | 2,436 | — |
| Short-term investments (1)   (2) : | Repurchase agreements | 375 | — | 375 | — |
| Short-term investments (1)   (2) : |  | 4,485 | 16 | 4,469 | — |
| Short-term investments (1)   (2) : | Restricted cash and short-term investments (1) | 154 | 12 | 142 | — |
| Short-term investments (1)   (2) : | Long-term investments (3) | 189 | 189 | — | — |
| Short-term investments (1)   (2) : | Total | $4,828 | $217 | $4,611 | $— |
Question:
What is the total amount of short-term investments (in millions) American Airlines made in 2018?
Answer:
4,485