Table:
|  |  | Years Ended December 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
|  |  | (Dollars in millions) |  |
| Transaction-related expenses | $— | 2 | 174 |
| Integration and transformation-related expenses | 234 | 391 | 97 |
| Total acquisition-related expenses | $234 | 393 | 271 |
Paragraphs:
Acquisition-Related Expenses
We have incurred acquisition-related expenses related to our acquisition of Level 3. The table below summarizes our acquisition-related expenses, which consist of integration and transformation-related expenses, including severance and retention compensation expenses, and transaction-related expenses:
At December 31, 2019, we had incurred cumulative acquisition-related expenses of $950 million for Level 3. The total amounts of these expenses are included in our selling, general and administrative expenses.
Level 3 incurred transaction-related expenses of $47 million on the date of acquisition. This amount is not included in our results of operations.
Question:
What expenses are included under the acquisition-related expenses?
Answer: integration and transformation-related expenses, severance and retention compensation expenses, transaction-related expenses