Table:
| FOR THE YEAR ENDED DECEMBER 31 | NOTE | 2019 | 2018 |
| --- | --- | --- | --- |
| Net assets of post-employment benefit plans | 24 | 558 | 331 |
| Long-term notes and other receivables |  | 142 | 89 |
| Derivative assets | 26 | 200 | 68 |
| Publicly-traded and privately-held investments | 26 | 129 | 110 |
| Investments (1) |  | 128 | 114 |
| Other |  | 117 | 135 |
| Total other non-current assets |  | 1,274 | 847 |
Paragraphs:
Note 18 Other non-current assets
(1) These amounts have been pledged as security related to obligations for certain employee benefits and are not available for general use.
Question:
What have the amounts for other non-current assets investments been pledged as?
Answer: security related to obligations for certain employee benefits and are not available for general use